test: Add proxy tests via proxy

On Travis with a local squid

4 files changed, 8009 insertions, 2 deletions

diff --git a/.travis.yml b/.travis.yml
index 617c4154..123e1783 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -55,6 +55,7 @@ install:
   - sudo apt-get install -qq --no-install-recommends autoconf automake
   - sudo apt-get install -qq --no-install-recommends faketime
   - sudo apt-get install -qq --no-install-recommends libmonitoring-plugin-perl
+  - sudo apt-get install -qq --no-install-recommends squid3
   # Trusty related dependencies (not yet provided)
   - test "$(dpkg -l | grep -E "mysql-(client|server)-[0-9].[0-9]" | grep -c ^ii)" -gt 0 || sudo apt-get install -qq --no-install-recommends mariadb-client mariadb-server
   # enable ssl apache
@@ -62,6 +63,8 @@ install:
   - sudo a2ensite default-ssl
   - sudo make-ssl-cert generate-default-snakeoil --force-overwrite
   - sudo service apache2 reload
+  - sudo cp tools/squid.conf /etc/squid3/squid.conf
+  - sudo service squid3 reload
 
 before_script:
   # ensure we have a test database in place for tests
@@ -93,4 +96,3 @@ notifications:
     skip_join: true
   email:
     # - team@monitoring-plugins.org
-
diff --git a/plugins/t/NPTest.cache.travis b/plugins/t/NPTest.cache.travis
index e9705f3b..28437a00 100644
--- a/plugins/t/NPTest.cache.travis
+++ b/plugins/t/NPTest.cache.travis
@@ -59,4 +59,6 @@
   'host_udp_time' => 'none',
   'host_tls_http' => 'localhost',
   'host_tls_cert' => 'localhost',
+  'NP_HOST_TCP_PROXY' => 'localhost',
+  'NP_PORT_TCP_PROXY' => '3128',
 }
diff --git a/plugins/t/check_http.t b/plugins/t/check_http.t
index 8bd484a0..416fbbcb 100644
--- a/plugins/t/check_http.t
+++ b/plugins/t/check_http.t
@@ -9,7 +9,7 @@ use Test::More;
 use POSIX qw/mktime strftime/;
 use NPTest;
 
-plan tests => 49;
+plan tests => 55;
 
 my $successOutput = '/OK.*HTTP.*second/';
 
@@ -42,6 +42,14 @@ my $host_tcp_http2  = getTestParameter( "NP_HOST_TCP_HTTP2",
             "A host providing an index page containing the string 'monitoring'",
             "test.monitoring-plugins.org" );
 
+my $host_tcp_proxy  = getTestParameter( "NP_HOST_TCP_PROXY",
+            "A host providing a HTTP proxy with CONNECT support",
+            "localhost");
+
+my $port_tcp_proxy  = getTestParameter( "NP_PORT_TCP_PROXY",
+            "Port of the proxy with HTTP and CONNECT support",
+            "3128");
+
 my $faketime = -x '/usr/bin/faketime' ? 1 : 0;
 
 
@@ -198,3 +206,19 @@ SKIP: {
         $res = NPTest->testCmd( "./check_http -H www.mozilla.com --extended-perfdata" );
         like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
 }
+
+SKIP: {
+        skip "No internet access or proxy configured", 6 if $internet_access eq "no" or ! $host_tcp_proxy;
+
+        $res = NPTest->testCmd( "./check_http -I $host_tcp_proxy -p $port_tcp_proxy -u http://$host_tcp_http -e 200,301,302");
+        is( $res->return_code, 0, "Proxy HTTP works");
+        like($res->output, qr/OK: Status line output matched/, "Proxy HTTP Output is sufficent");
+
+        $res = NPTest->testCmd( "./check_http -I $host_tcp_proxy -p $port_tcp_proxy -H $host_tls_http -S -j CONNECT");
+        is( $res->return_code, 0, "Proxy HTTP CONNECT works");
+        like($res->output, qr/HTTP OK:/, "Proxy HTTP CONNECT output sufficent");
+
+        $res = NPTest->testCmd( "./check_http -I $host_tcp_proxy -p $port_tcp_proxy -H $host_tls_http -S -j CONNECT:HEAD");
+        is( $res->return_code, 0, "Proxy HTTP CONNECT works with override method");
+        like($res->output, qr/HTTP OK:/, "Proxy HTTP CONNECT output sufficent");
+}
diff --git a/tools/squid.conf b/tools/squid.conf
new file mode 100644
index 00000000..bed7a583
--- /dev/null
+++ b/tools/squid.conf
@@ -0,0 +1,7979 @@
+#	WELCOME TO SQUID 3.5.27
+#	----------------------------
+#
+#	This is the documentation for the Squid configuration file.
+#	This documentation can also be found online at:
+#		http://www.squid-cache.org/Doc/config/
+#
+#	You may wish to look at the Squid home page and wiki for the
+#	FAQ and other documentation:
+#		http://www.squid-cache.org/
+#		http://wiki.squid-cache.org/SquidFaq
+#		http://wiki.squid-cache.org/ConfigExamples
+#
+#	This documentation shows what the defaults for various directives
+#	happen to be.  If you don't need to change the default, you should
+#	leave the line out of your squid.conf in most cases.
+#
+#	In some cases "none" refers to no default setting at all,
+#	while in other cases it refers to the value of the option
+#	- the comments for that keyword indicate if this is the case.
+#
+
+#  Configuration options can be included using the "include" directive.
+#  Include takes a list of files to include. Quoting and wildcards are
+#  supported.
+#
+#  For example,
+#
+#  include /path/to/included/file/squid.acl.config
+#
+#  Includes can be nested up to a hard-coded depth of 16 levels.
+#  This arbitrary restriction is to prevent recursive include references
+#  from causing Squid entering an infinite loop whilst trying to load
+#  configuration files.
+#
+#  Values with byte units
+#
+#	Squid accepts size units on some size related directives. All
+#	such directives are documented with a default value displaying
+#	a unit.
+#
+#	Units accepted by Squid are:
+#		bytes - byte
+#		KB - Kilobyte (1024 bytes)
+#		MB - Megabyte
+#		GB - Gigabyte
+#
+#  Values with spaces, quotes, and other special characters
+#
+#	Squid supports directive parameters with spaces, quotes, and other
+#	special characters. Surround such parameters with "double quotes". Use
+#	the configuration_includes_quoted_values directive to enable or
+#	disable that support.
+#
+#	Squid supports reading configuration option parameters from external
+#	files using the syntax:
+#		parameters("/path/filename")
+#	For example:
+#		acl whitelist dstdomain parameters("/etc/squid/whitelist.txt")
+#
+#  Conditional configuration
+#
+#	If-statements can be used to make configuration directives
+#	depend on conditions:
+#
+#	    if <CONDITION>
+#	        ... regular configuration directives ...
+#	    [else
+#	        ... regular configuration directives ...]
+#	    endif
+#
+#	The else part is optional. The keywords "if", "else", and "endif"
+#	must be typed on their own lines, as if they were regular
+#	configuration directives.
+#
+#	NOTE: An else-if condition is not supported.
+#
+#	These individual conditions types are supported:
+#
+#	    true
+#		Always evaluates to true.
+#	    false
+#		Always evaluates to false.
+#	    <integer> = <integer>
+#	        Equality comparison of two integer numbers.
+#
+#
+#  SMP-Related Macros
+#
+#	The following SMP-related preprocessor macros can be used.
+#
+#	${process_name} expands to the current Squid process "name"
+#	(e.g., squid1, squid2, or cache1).
+#
+#	${process_number} expands to the current Squid process
+#	identifier, which is an integer number (e.g., 1, 2, 3) unique
+#	across all Squid processes of the current service instance.
+#
+#	${service_name} expands into the current Squid service instance
+#	name identifier which is provided by -n on the command line.
+#
+
+#  TAG: broken_vary_encoding
+#	This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: cache_vary
+#	This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: error_map
+#	This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: external_refresh_check
+#	This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: location_rewrite_program
+#	This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: refresh_stale_hit
+#	This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: hierarchy_stoplist
+#	Remove this line. Use always_direct or cache_peer_access ACLs instead if you need to prevent cache_peer use.
+#Default:
+# none
+
+#  TAG: log_access
+#	Remove this line. Use acls with access_log directives to control access logging
+#Default:
+# none
+
+#  TAG: log_icap
+#	Remove this line. Use acls with icap_log directives to control icap logging
+#Default:
+# none
+
+#  TAG: ignore_ims_on_miss
+#	Remove this line. The HTTP/1.1 feature is now configured by 'cache_miss_revalidate'.
+#Default:
+# none
+
+#  TAG: chunked_request_body_max_size
+#	Remove this line. Squid is now HTTP/1.1 compliant.
+#Default:
+# none
+
+#  TAG: dns_v4_fallback
+#	Remove this line. Squid performs a 'Happy Eyeballs' algorithm, the 'fallback' algorithm is no longer relevant.
+#Default:
+# none
+
+#  TAG: emulate_httpd_log
+#	Replace this with an access_log directive using the format 'common' or 'combined'.
+#Default:
+# none
+
+#  TAG: forward_log
+#	Use a regular access.log with ACL limiting it to MISS events.
+#Default:
+# none
+
+#  TAG: ftp_list_width
+#	Remove this line. Configure FTP page display using the CSS controls in errorpages.css instead.
+#Default:
+# none
+
+#  TAG: ignore_expect_100
+#	Remove this line. The HTTP/1.1 feature is now fully supported by default.
+#Default:
+# none
+
+#  TAG: log_fqdn
+#	Remove this option from your config. To log FQDN use %>A in the log format.
+#Default:
+# none
+
+#  TAG: log_ip_on_direct
+#	Remove this option from your config. To log server or peer names use %<A in the log format.
+#Default:
+# none
+
+#  TAG: maximum_single_addr_tries
+#	Replaced by connect_retries. The behaviour has changed, please read the documentation before altering.
+#Default:
+# none
+
+#  TAG: referer_log
+#	Replace this with an access_log directive using the format 'referrer'.
+#Default:
+# none
+
+#  TAG: update_headers
+#	Remove this line. The feature is supported by default in storage types where update is implemented.
+#Default:
+# none
+
+#  TAG: url_rewrite_concurrency
+#	Remove this line. Set the 'concurrency=' option of url_rewrite_children instead.
+#Default:
+# none
+
+#  TAG: useragent_log
+#	Replace this with an access_log directive using the format 'useragent'.
+#Default:
+# none
+
+#  TAG: dns_testnames
+#	Remove this line. DNS is no longer tested on startup.
+#Default:
+# none
+
+#  TAG: extension_methods
+#	Remove this line. All valid methods for HTTP are accepted by default.
+#Default:
+# none
+
+#  TAG: zero_buffers
+#Default:
+# none
+
+#  TAG: incoming_rate
+#Default:
+# none
+
+#  TAG: server_http11
+#	Remove this line. HTTP/1.1 is supported by default.
+#Default:
+# none
+
+#  TAG: upgrade_http0.9
+#	Remove this line. ICY/1.0 streaming protocol is supported by default.
+#Default:
+# none
+
+#  TAG: zph_local
+#	Alter these entries. Use the qos_flows directive instead.
+#Default:
+# none
+
+#  TAG: header_access
+#	Since squid-3.0 replace with request_header_access or reply_header_access
+#	depending on whether you wish to match client requests or server replies.
+#Default:
+# none
+
+#  TAG: httpd_accel_no_pmtu_disc
+#	Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead.
+#Default:
+# none
+
+#  TAG: wais_relay_host
+#	Replace this line with 'cache_peer' configuration.
+#Default:
+# none
+
+#  TAG: wais_relay_port
+#	Replace this line with 'cache_peer' configuration.
+#Default:
+# none
+
+# OPTIONS FOR SMP
+# -----------------------------------------------------------------------------
+
+#  TAG: workers
+#	Number of main Squid processes or "workers" to fork and maintain.
+#	0: "no daemon" mode, like running "squid -N ..."
+#	1: "no SMP" mode, start one main Squid process daemon (default)
+#	N: start N main Squid process daemons (i.e., SMP mode)
+#
+#	In SMP mode, each worker does nearly all what a single Squid daemon
+#	does (e.g., listen on http_port and forward HTTP requests).
+#Default:
+# SMP support disabled.
+
+#  TAG: cpu_affinity_map
+#	Usage: cpu_affinity_map process_numbers=P1,P2,... cores=C1,C2,...
+#
+#	Sets 1:1 mapping between Squid processes and CPU cores. For example,
+#
+#	    cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7
+#
+#	affects processes 1 through 4 only and places them on the first
+#	four even cores, starting with core #1.
+#
+#	CPU cores are numbered starting from 1. Requires support for
+#	sched_getaffinity(2) and sched_setaffinity(2) system calls.
+#
+#	Multiple cpu_affinity_map options are merged.
+#
+#	See also: workers
+#Default:
+# Let operating system decide.
+
+# OPTIONS FOR AUTHENTICATION
+# -----------------------------------------------------------------------------
+
+#  TAG: auth_param
+#	This is used to define parameters for the various authentication
+#	schemes supported by Squid.
+#
+#		format: auth_param scheme parameter [setting]
+#
+#	The order in which authentication schemes are presented to the client is
+#	dependent on the order the scheme first appears in config file. IE
+#	has a bug (it's not RFC 2617 compliant) in that it will use the basic
+#	scheme if basic is the first entry presented, even if more secure
+#	schemes are presented. For now use the order in the recommended
+#	settings section below. If other browsers have difficulties (don't
+#	recognize the schemes offered even if you are using basic) either
+#	put basic first, or disable the other schemes (by commenting out their
+#	program entry).
+#
+#	Once an authentication scheme is fully configured, it can only be
+#	shutdown by shutting squid down and restarting. Changes can be made on
+#	the fly and activated with a reconfigure. I.E. You can change to a
+#	different helper, but not unconfigure the helper completely.
+#
+#	Please note that while this directive defines how Squid processes
+#	authentication it does not automatically activate authentication.
+#	To use authentication you must in addition make use of ACLs based
+#	on login name in http_access (proxy_auth, proxy_auth_regex or
+#	external with %LOGIN used in the format tag). The browser will be
+#	challenged for authentication on the first such acl encountered
+#	in http_access processing and will also be re-challenged for new
+#	login credentials if the request is being denied by a proxy_auth
+#	type acl.
+#
+#	WARNING: authentication can't be used in a transparently intercepting
+#	proxy as the client then thinks it is talking to an origin server and
+#	not the proxy. This is a limitation of bending the TCP/IP protocol to
+#	transparently intercepting port 80, not a limitation in Squid.
+#	Ports flagged 'transparent', 'intercept', or 'tproxy' have
+#	authentication disabled.
+#
+#	=== Parameters common to all schemes. ===
+#
+#	"program" cmdline
+#		Specifies the command for the external authenticator.
+#
+#		By default, each authentication scheme is not used unless a
+#		program is specified.
+#
+#		See http://wiki.squid-cache.org/Features/AddonHelpers for
+#		more details on helper operations and creating your own.
+#
+#	"key_extras" format
+#		Specifies a string to be append to request line format for
+#		the authentication helper. "Quoted" format values may contain
+#		spaces and logformat %macros. In theory, any logformat %macro
+#		can be used. In practice, a %macro expands as a dash (-) if
+#		the helper request is sent before the required macro
+#		information is available to Squid.
+#
+#		By default, Squid uses request formats provided in
+#		scheme-specific examples below (search for %credentials).
+#
+#		The expanded key_extras value is added to the Squid credentials
+#		cache and, hence, will affect authentication. It can be used to
+#		autenticate different users with identical user names (e.g.,
+#		when user authentication depends on http_port).
+#
+#		Avoid adding frequently changing information to key_extras. For
+#		example, if you add user source IP, and it changes frequently
+#		in your environment, then max_user_ip ACL is going to treat
+#		every user+IP combination as a unique "user", breaking the ACL
+#		and wasting a lot of memory on those user records. It will also
+#		force users to authenticate from scratch whenever their IP
+#		changes.
+#
+#	"realm" string
+#		Specifies the protection scope (aka realm name) which is to be
+#		reported to the client for the authentication scheme. It is
+#		commonly part of the text the user will see when prompted for
+#		their username and password.
+#
+#		For Basic the default is "Squid proxy-caching web server".
+#		For Digest there is no default, this parameter is mandatory.
+#		For NTLM and Negotiate this parameter is ignored.
+#
+#	"children" numberofchildren [startup=N] [idle=N] [concurrency=N]
+#
+#		The maximum number of authenticator processes to spawn. If
+#		you start too few Squid will have to wait for them to process
+#		a backlog of credential verifications, slowing it down. When
+#		password verifications are done via a (slow) network you are
+#		likely to need lots of authenticator processes.
+#
+#		The startup= and idle= options permit some skew in the exact
+#		amount run. A minimum of startup=N will begin during startup
+#		and reconfigure. Squid will start more in groups of up to
+#		idle=N in an attempt to meet traffic needs and to keep idle=N
+#		free above those traffic needs up to the maximum.
+#
+#		The concurrency= option sets the number of concurrent requests
+#		the helper can process.  The default of 0 is used for helpers
+#		who only supports one request at a time. Setting this to a
+#		number greater than 0 changes the protocol used to include a
+#		channel ID field first on the request/response line, allowing
+#		multiple requests to be sent to the same helper in parallel
+#		without waiting for the response.
+#
+#		Concurrency must not be set unless it's known the helper
+#		supports the input format with channel-ID fields.
+#
+#		NOTE: NTLM and Negotiate schemes do not support concurrency
+#			in the Squid code module even though some helpers can.
+#
+#
+#
+#	=== Example Configuration ===
+#
+#	This configuration displays the recommended authentication scheme
+#	order from most to least secure with recommended minimum configuration
+#	settings for each scheme:
+#
+##auth_param negotiate program <uncomment and complete this line to activate>
+##auth_param negotiate children 20 startup=0 idle=1
+##auth_param negotiate keep_alive on
+##
+##auth_param digest program <uncomment and complete this line to activate>
+##auth_param digest children 20 startup=0 idle=1
+##auth_param digest realm Squid proxy-caching web server
+##auth_param digest nonce_garbage_interval 5 minutes
+##auth_param digest nonce_max_duration 30 minutes
+##auth_param digest nonce_max_count 50
+##
+##auth_param ntlm program <uncomment and complete this line to activate>
+##auth_param ntlm children 20 startup=0 idle=1
+##auth_param ntlm keep_alive on
+##
+##auth_param basic program <uncomment and complete this line>
+##auth_param basic children 5 startup=5 idle=1
+##auth_param basic realm Squid proxy-caching web server
+##auth_param basic credentialsttl 2 hours
+#Default:
+# none
+
+#  TAG: authenticate_cache_garbage_interval
+#	The time period between garbage collection across the username cache.
+#	This is a trade-off between memory utilization (long intervals - say
+#	2 days) and CPU (short intervals - say 1 minute). Only change if you
+#	have good reason to.
+#Default:
+# authenticate_cache_garbage_interval 1 hour
+
+#  TAG: authenticate_ttl
+#	The time a user & their credentials stay in the logged in
+#	user cache since their last request. When the garbage
+#	interval passes, all user credentials that have passed their
+#	TTL are removed from memory.
+#Default:
+# authenticate_ttl 1 hour
+
+#  TAG: authenticate_ip_ttl
+#	If you use proxy authentication and the 'max_user_ip' ACL,
+#	this directive controls how long Squid remembers the IP
+#	addresses associated with each user.  Use a small value
+#	(e.g., 60 seconds) if your users might change addresses
+#	quickly, as is the case with dialup.   You might be safe
+#	using a larger value (e.g., 2 hours) in a corporate LAN
+#	environment with relatively static address assignments.
+#Default:
+# authenticate_ip_ttl 1 second
+
+# ACCESS CONTROLS
+# -----------------------------------------------------------------------------
+
+#  TAG: external_acl_type
+#	This option defines external acl classes using a helper program
+#	to look up the status
+#
+#	  external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..]
+#
+#	Options:
+#
+#	  ttl=n		TTL in seconds for cached results (defaults to 3600
+#	  		for 1 hour)
+#
+#	  negative_ttl=n
+#	  		TTL for cached negative lookups (default same
+#	  		as ttl)
+#
+#	  grace=n	Percentage remaining of TTL where a refresh of a
+#			cached entry should be initiated without needing to
+#			wait for a new reply. (default is for no grace period)
+#
+#	  cache=n	The maximum number of entries in the result cache. The
+#			default limit is 262144 entries.  Each cache entry usually
+#			consumes at least 256 bytes. Squid currently does not remove
+#			expired cache entries until the limit is reached, so a proxy
+#			will sooner or later reach the limit. The expanded FORMAT
+#			value is used as the cache key, so if the details in FORMAT
+#			are highly variable, a larger cache may be needed to produce
+#			reduction in helper load.
+#
+#	  children-max=n
+#			Maximum number of acl helper processes spawned to service
+#			external acl lookups of this type. (default 5)
+#
+#	  children-startup=n
+#			Minimum number of acl helper processes to spawn during
+#			startup and reconfigure to service external acl lookups
+#			of this type. (default 0)
+#
+#	  children-idle=n
+#			Number of acl helper processes to keep ahead of traffic
+#			loads. Squid will spawn this many at once whenever load
+#			rises above the capabilities of existing processes.
+#			Up to the value of children-max. (default 1)
+#
+#	  concurrency=n	concurrency level per process. Only used with helpers
+#			capable of processing more than one query at a time.
+#
+#	  protocol=2.5	Compatibility mode for Squid-2.5 external acl helpers.
+#
+#	  ipv4 / ipv6	IP protocol used to communicate with this helper.
+#			The default is to auto-detect IPv6 and use it when available.
+#
+#
+#	FORMAT specifications
+#
+#	  %LOGIN	Authenticated user login name
+#	  %un		A user name. Expands to the first available name
+#	  		from the following list of information sources:
+#			- authenticated user name, like %ul or %LOGIN
+#			- user name sent by an external ACL, like %EXT_USER
+#			- SSL client name, like %us in logformat
+#			- ident user name, like %ui in logformat
+#	  %EXT_USER	Username from previous external acl
+#	  %EXT_LOG	Log details from previous external acl
+#	  %EXT_TAG	Tag from previous external acl
+#	  %IDENT	Ident user name
+#	  %SRC		Client IP
+#	  %SRCPORT	Client source port
+#	  %URI		Requested URI
+#	  %DST		Requested host
+#	  %PROTO	Requested URL scheme
+#	  %PORT		Requested port
+#	  %PATH		Requested URL path
+#	  %METHOD	Request method
+#	  %MYADDR	Squid interface address
+#	  %MYPORT	Squid http_port number
+#	  %PATH		Requested URL-path (including query-string if any)
+#	  %USER_CERT	SSL User certificate in PEM format
+#	  %USER_CERTCHAIN SSL User certificate chain in PEM format
+#	  %USER_CERT_xx	SSL User certificate subject attribute xx
+#	  %USER_CA_CERT_xx SSL User certificate issuer attribute xx
+#	  %ssl::>sni	SSL client SNI sent to Squid
+#	  %ssl::<cert_subject SSL server certificate DN
+#	  %ssl::<cert_issuer SSL server certificate issuer DN
+#
+#	  %>{Header}	HTTP request header "Header"
+#	  %>{Hdr:member}
+#	  		HTTP request header "Hdr" list member "member"
+#	  %>{Hdr:;member}
+#	  		HTTP request header list member using ; as
+#	  		list separator. ; can be any non-alphanumeric
+#			character.
+#
+#	  %<{Header}	HTTP reply header "Header"
+#	  %<{Hdr:member}
+#	  		HTTP reply header "Hdr" list member "member"
+#	  %<{Hdr:;member}
+#	  		HTTP reply header list member using ; as
+#	  		list separator. ; can be any non-alphanumeric
+#			character.
+#
+#	  %ACL		The name of the ACL being tested.
+#	  %DATA		The ACL arguments. If not used then any arguments
+#			is automatically added at the end of the line
+#			sent to the helper.
+#			NOTE: this will encode the arguments as one token,
+#			whereas the default will pass each separately.
+#
+#	  %%		The percent sign. Useful for helpers which need
+#			an unchanging input format.
+#
+#
+#	General request syntax:
+#
+#	  [channel-ID] FORMAT-values [acl-values ...]
+#
+#
+#	FORMAT-values consists of transaction details expanded with
+#	whitespace separation per the config file FORMAT specification
+#	using the FORMAT macros listed above.
+#
+#	acl-values consists of any string specified in the referencing
+#	config 'acl ... external' line. see the "acl external" directive.
+#
+#	Request values sent to the helper are URL escaped to protect
+#	each value in requests against whitespaces.
+#
+#	If using protocol=2.5 then the request sent to the helper is not
+#	URL escaped to protect against whitespace.
+#
+#	NOTE: protocol=3.0 is deprecated as no longer necessary.
+#
+#	When using the concurrency= option the protocol is changed by
+#	introducing a query channel tag in front of the request/response.
+#	The query channel tag is a number between 0 and concurrency-1.
+#	This value must be echoed back unchanged to Squid as the first part
+#	of the response relating to its request.
+#
+#
+#	The helper receives lines expanded per the above format specification
+#	and for each input line returns 1 line starting with OK/ERR/BH result
+#	code and optionally followed by additional keywords with more details.
+#
+#
+#	General result syntax:
+#
+#	  [channel-ID] result keyword=value ...
+#
+#	Result consists of one of the codes:
+#
+#	  OK
+#		the ACL test produced a match.
+#
+#	  ERR
+#		the ACL test does not produce a match.
+#
+#	  BH
+#		An internal error occurred in the helper, preventing
+#		a result being identified.
+#
+#	The meaning of 'a match' is determined by your squid.conf
+#	access control configuration. See the Squid wiki for details.
+#
+#	Defined keywords:
+#
+#	  user=		The users name (login)
+#
+#	  password=	The users password (for login= cache_peer option)
+#
+#	  message=	Message describing the reason for this response.
+#			Available as %o in error pages.
+#			Useful on (ERR and BH results).
+#
+#	  tag=		Apply a tag to a request. Only sets a tag once,
+#			does not alter existing tags.
+#
+#	  log=		String to be logged in access.log. Available as
+#	  		%ea in logformat specifications.
+#
+#  	  clt_conn_tag= Associates a TAG with the client TCP connection.
+#			Please see url_rewrite_program related documentation
+#			for this kv-pair.
+#
+#	Any keywords may be sent on any response whether OK, ERR or BH.
+#
+#	All response keyword values need to be a single token with URL
+#	escaping, or enclosed in double quotes (") and escaped using \ on
+#	any double quotes or \ characters within the value. The wrapping
+#	double quotes are removed before the value is interpreted by Squid.
+#	\r and \n are also replace by CR and LF.
+#
+#	Some example key values:
+#
+#		user=John%20Smith
+#		user="John Smith"
+#		user="J. \"Bob\" Smith"
+#Default:
+# none
+
+#  TAG: acl
+#	Defining an Access List
+#
+#	Every access list definition must begin with an aclname and acltype,
+#	followed by either type-specific arguments or a quoted filename that
+#	they are read from.
+#
+#	   acl aclname acltype argument ...
+#	   acl aclname acltype "file" ...
+#
+#	When using "file", the file should contain one item per line.
+#
+#	Some acl types supports options which changes their default behaviour.
+#	The available options are:
+#
+#	-i,+i	By default, regular expressions are CASE-SENSITIVE. To make them
+#		case-insensitive, use the -i option. To return case-sensitive
+#		use the +i option between patterns, or make a new ACL line
+#		without -i.
+#
+#	-n	Disable lookups and address type conversions.  If lookup or
+#		conversion is required because the parameter type (IP or
+#		domain name) does not match the message address type (domain
+#		name or IP), then the ACL would immediately declare a mismatch
+#		without any warnings or lookups.
+#
+#	--	Used to stop processing all options, in the case the first acl
+#		value has '-' character as first character (for example the '-'
+#		is a valid domain name)
+#
+#	Some acl types require suspending the current request in order
+#	to access some external data source.
+#	Those which do are marked with the tag [slow], those which
+#	don't are marked as [fast].
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl
+#	for further information
+#
+#	***** ACL TYPES AVAILABLE *****
+#
+#	acl aclname src ip-address/mask ...	# clients IP address [fast]
+#	acl aclname src addr1-addr2/mask ...	# range of addresses [fast]
+#	acl aclname dst [-n] ip-address/mask ...	# URL host's IP address [slow]
+#	acl aclname localip ip-address/mask ... # IP address the client connected to [fast]
+#
+#	acl aclname arp      mac-address ... (xx:xx:xx:xx:xx:xx notation)
+#	  # [fast]
+#	  # The 'arp' ACL code is not portable to all operating systems.
+#	  # It works on Linux, Solaris, Windows, FreeBSD, and some other
+#	  # BSD variants.
+#	  #
+#	  # NOTE: Squid can only determine the MAC/EUI address for IPv4
+#	  # clients that are on the same subnet. If the client is on a
+#	  # different subnet, then Squid cannot find out its address.
+#	  #
+#	  # NOTE 2: IPv6 protocol does not contain ARP. MAC/EUI is either
+#	  # encoded directly in the IPv6 address or not available.
+#
+#	acl aclname srcdomain   .foo.com ...
+#	  # reverse lookup, from client IP [slow]
+#	acl aclname dstdomain [-n] .foo.com ...
+#	  # Destination server from URL [fast]
+#	acl aclname srcdom_regex [-i] \.foo\.com ...
+#	  # regex matching client name [slow]
+#	acl aclname dstdom_regex [-n] [-i] \.foo\.com ...
+#	  # regex matching server [fast]
+#	  #
+#	  # For dstdomain and dstdom_regex a reverse lookup is tried if a IP
+#	  # based URL is used and no match is found. The name "none" is used
+#	  # if the reverse lookup fails.
+#
+#	acl aclname src_as number ...
+#	acl aclname dst_as number ...
+#	  # [fast]
+#	  # Except for access control, AS numbers can be used for
+#	  # routing of requests to specific caches. Here's an
+#	  # example for routing all requests for AS#1241 and only
+#	  # those to mycache.mydomain.net:
+#	  # acl asexample dst_as 1241
+#	  # cache_peer_access mycache.mydomain.net allow asexample
+#	  # cache_peer_access mycache_mydomain.net deny all
+#
+#	acl aclname peername myPeer ...
+#	  # [fast]
+#	  # match against a named cache_peer entry
+#	  # set unique name= on cache_peer lines for reliable use.
+#
+#	acl aclname time [day-abbrevs] [h1:m1-h2:m2]
+#	  # [fast]
+#	  #  day-abbrevs:
+#	  #	S - Sunday
+#	  #	M - Monday
+#	  #	T - Tuesday
+#	  #	W - Wednesday
+#	  #	H - Thursday
+#	  #	F - Friday
+#	  #	A - Saturday
+#	  #  h1:m1 must be less than h2:m2
+#
+#	acl aclname url_regex [-i] ^http:// ...
+#	  # regex matching on whole URL [fast]
+#	acl aclname urllogin [-i] [^a-zA-Z0-9] ...
+#	  # regex matching on URL login field
+#	acl aclname urlpath_regex [-i] \.gif$ ...
+#	  # regex matching on URL path [fast]
+#
+#	acl aclname port 80 70 21 0-1024...   # destination TCP port [fast]
+#	                                      # ranges are alloed
+#	acl aclname localport 3128 ...	      # TCP port the client connected to [fast]
+#	                                      # NP: for interception mode this is usually '80'
+#
+#	acl aclname myportname 3128 ...       # *_port name [fast]
+#
+#	acl aclname proto HTTP FTP ...        # request protocol [fast]
+#
+#	acl aclname method GET POST ...       # HTTP request method [fast]
+#
+#	acl aclname http_status 200 301 500- 400-403 ...
+#	  # status code in reply [fast]
+#
+#	acl aclname browser [-i] regexp ...
+#	  # pattern match on User-Agent header (see also req_header below) [fast]
+#
+#	acl aclname referer_regex [-i] regexp ...
+#	  # pattern match on Referer header [fast]
+#	  # Referer is highly unreliable, so use with care
+#
+#	acl aclname ident username ...
+#	acl aclname ident_regex [-i] pattern ...
+#	  # string match on ident output [slow]
+#	  # use REQUIRED to accept any non-null ident.
+#
+#	acl aclname proxy_auth [-i] username ...
+#	acl aclname proxy_auth_regex [-i] pattern ...
+#	  # perform http authentication challenge to the client and match against
+#	  # supplied credentials [slow]
+#	  #
+#	  # takes a list of allowed usernames.
+#	  # use REQUIRED to accept any valid username.
+#	  #
+#	  # Will use proxy authentication in forward-proxy scenarios, and plain
+#	  # http authenticaiton in reverse-proxy scenarios
+#	  #
+#	  # NOTE: when a Proxy-Authentication header is sent but it is not
+#	  # needed during ACL checking the username is NOT logged
+#	  # in access.log.
+#	  #
+#	  # NOTE: proxy_auth requires a EXTERNAL authentication program
+#	  # to check username/password combinations (see
+#	  # auth_param directive).
+#	  #
+#	  # NOTE: proxy_auth can't be used in a transparent/intercepting proxy
+#	  # as the browser needs to be configured for using a proxy in order
+#	  # to respond to proxy authentication.
+#
+#	acl aclname snmp_community string ...
+#	  # A community string to limit access to your SNMP Agent [fast]
+#	  # Example:
+#	  #
+#	  #	acl snmppublic snmp_community public
+#
+#	acl aclname maxconn number
+#	  # This will be matched when the client's IP address has
+#	  # more than <number> TCP connections established. [fast]
+#	  # NOTE: This only measures direct TCP links so X-Forwarded-For
+#	  # indirect clients are not counted.
+#
+#	acl aclname max_user_ip [-s] number
+#	  # This will be matched when the user attempts to log in from more
+#	  # than <number> different ip addresses. The authenticate_ip_ttl
+#	  # parameter controls the timeout on the ip entries. [fast]
+#	  # If -s is specified the limit is strict, denying browsing
+#	  # from any further IP addresses until the ttl has expired. Without
+#	  # -s Squid will just annoy the user by "randomly" denying requests.
+#	  # (the counter is reset each time the limit is reached and a
+#	  # request is denied)
+#	  # NOTE: in acceleration mode or where there is mesh of child proxies,
+#	  # clients may appear to come from multiple addresses if they are
+#	  # going through proxy farms, so a limit of 1 may cause user problems.
+#
+#	acl aclname random probability
+#	  # Pseudo-randomly match requests. Based on the probability given.
+#	  # Probability may be written as a decimal (0.333), fraction (1/3)
+#	  # or ratio of matches:non-matches (3:5).
+#
+#	acl aclname req_mime_type [-i] mime-type ...
+#	  # regex match against the mime type of the request generated
+#	  # by the client. Can be used to detect file upload or some
+#	  # types HTTP tunneling requests [fast]
+#	  # NOTE: This does NOT match the reply. You cannot use this
+#	  # to match the returned file type.
+#
+#	acl aclname req_header header-name [-i] any\.regex\.here
+#	  # regex match against any of the known request headers.  May be
+#	  # thought of as a superset of "browser", "referer" and "mime-type"
+#	  # ACL [fast]
+#
+#	acl aclname rep_mime_type [-i] mime-type ...
+#	  # regex match against the mime type of the reply received by
+#	  # squid. Can be used to detect file download or some
+#	  # types HTTP tunneling requests. [fast]
+#	  # NOTE: This has no effect in http_access rules. It only has
+#	  # effect in rules that affect the reply data stream such as
+#	  # http_reply_access.
+#
+#	acl aclname rep_header header-name [-i] any\.regex\.here
+#	  # regex match against any of the known reply headers. May be
+#	  # thought of as a superset of "browser", "referer" and "mime-type"
+#	  # ACLs [fast]
+#
+#	acl aclname external class_name [arguments...]
+#	  # external ACL lookup via a helper class defined by the
+#	  # external_acl_type directive [slow]
+#
+#	acl aclname user_cert attribute values...
+#	  # match against attributes in a user SSL certificate
+#	  # attribute is one of DN/C/O/CN/L/ST or a numerical OID [fast]
+#
+#	acl aclname ca_cert attribute values...
+#	  # match against attributes a users issuing CA SSL certificate
+#	  # attribute is one of DN/C/O/CN/L/ST or a numerical OID  [fast]
+#
+#	acl aclname ext_user username ...
+#	acl aclname ext_user_regex [-i] pattern ...
+#	  # string match on username returned by external acl helper [slow]
+#	  # use REQUIRED to accept any non-null user name.
+#
+#	acl aclname tag tagvalue ...
+#	  # string match on tag returned by external acl helper [fast]
+#	  # DEPRECATED. Only the first tag will match with this ACL.
+#	  # Use the 'note' ACL instead for handling multiple tag values.
+#
+#	acl aclname hier_code codename ...
+#	  # string match against squid hierarchy code(s); [fast]
+#	  #  e.g., DIRECT, PARENT_HIT, NONE, etc.
+#	  #
+#	  # NOTE: This has no effect in http_access rules. It only has
+#	  # effect in rules that affect the reply data stream such as
+#	  # http_reply_access.
+#
+#	acl aclname note name [value ...]
+#	  # match transaction annotation [fast]
+#	  # Without values, matches any annotation with a given name.
+#	  # With value(s), matches any annotation with a given name that
+#	  # also has one of the given values.
+#	  # Names and values are compared using a string equality test.
+#	  # Annotation sources include note and adaptation_meta directives
+#	  # as well as helper and eCAP responses.
+#
+#	acl aclname adaptation_service service ...
+#	  # Matches the name of any icap_service, ecap_service,
+#	  # adaptation_service_set, or adaptation_service_chain that Squid
+#	  # has used (or attempted to use) for the master transaction.
+#	  # This ACL must be defined after the corresponding adaptation
+#	  # service is named in squid.conf. This ACL is usable with
+#	  # adaptation_meta because it starts matching immediately after
+#	  # the service has been selected for adaptation.
+#
+#	acl aclname any-of acl1 acl2 ...
+#	  # match any one of the acls [fast or slow]
+#	  # The first matching ACL stops further ACL evaluation.
+#	  #
+#	  # ACLs from multiple any-of lines with the same name are ORed.
+#	  # For example, A = (a1 or a2) or (a3 or a4) can be written as
+#	  #   acl A any-of a1 a2
+#	  #   acl A any-of a3 a4
+#	  #
+#	  # This group ACL is fast if all evaluated ACLs in the group are fast
+#	  # and slow otherwise.
+#
+#	acl aclname all-of acl1 acl2 ...
+#	  # match all of the acls [fast or slow]
+#	  # The first mismatching ACL stops further ACL evaluation.
+#	  #
+#	  # ACLs from multiple all-of lines with the same name are ORed.
+#	  # For example, B = (b1 and b2) or (b3 and b4) can be written as
+#	  #   acl B all-of b1 b2
+#	  #   acl B all-of b3 b4
+#	  #
+#	  # This group ACL is fast if all evaluated ACLs in the group are fast
+#	  # and slow otherwise.
+#
+#	Examples:
+#		acl macaddress arp 09:00:2b:23:45:67
+#		acl myexample dst_as 1241
+#		acl password proxy_auth REQUIRED
+#		acl fileupload req_mime_type -i ^multipart/form-data$
+#		acl javascript rep_mime_type -i ^application/x-javascript$
+#
+#Default:
+# ACLs all, manager, localhost, and to_localhost are predefined.
+#
+#
+# Recommended minimum configuration:
+#
+
+# Example rule allowing access from your local networks.
+# Adapt to list your (internal) IP networks from where browsing
+# should be allowed
+acl localnet src 10.0.0.0/8	# RFC1918 possible internal network
+acl localnet src 172.16.0.0/12	# RFC1918 possible internal network
+acl localnet src 192.168.0.0/16	# RFC1918 possible internal network
+acl localnet src fc00::/7       # RFC 4193 local private network range
+acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines
+
+acl SSL_ports port 443
+acl Safe_ports port 80		# http
+acl Safe_ports port 21		# ftp
+acl Safe_ports port 443		# https
+acl Safe_ports port 70		# gopher
+acl Safe_ports port 210		# wais
+acl Safe_ports port 1025-65535	# unregistered ports
+acl Safe_ports port 280		# http-mgmt
+acl Safe_ports port 488		# gss-http
+acl Safe_ports port 591		# filemaker
+acl Safe_ports port 777		# multiling http
+acl CONNECT method CONNECT
+
+#  TAG: proxy_protocol_access
+#	Determine which client proxies can be trusted to provide correct
+#	information regarding real client IP address using PROXY protocol.
+#
+#	Requests may pass through a chain of several other proxies
+#	before reaching us. The original source details may by sent in:
+#		* HTTP message Forwarded header, or
+#		* HTTP message X-Forwarded-For header, or
+#		* PROXY protocol connection header.
+#
+#	This directive is solely for validating new PROXY protocol
+#	connections received from a port flagged with require-proxy-header.
+#	It is checked only once after TCP connection setup.
+#
+#	A deny match results in TCP connection closure.
+#
+#	An allow match is required for Squid to permit the corresponding
+#	TCP connection, before Squid even looks for HTTP request headers.
+#	If there is an allow match, Squid starts using PROXY header information
+#	to determine the source address of the connection for all future ACL
+#	checks, logging, etc.
+#
+#	SECURITY CONSIDERATIONS:
+#
+#		Any host from which we accept client IP details can place
+#		incorrect information in the relevant header, and Squid
+#		will use the incorrect information as if it were the
+#		source address of the request.  This may enable remote
+#		hosts to bypass any access control restrictions that are
+#		based on the client's source addresses.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# all TCP connections to ports with require-proxy-header will be denied
+
+#  TAG: follow_x_forwarded_for
+#	Determine which client proxies can be trusted to provide correct
+#	information regarding real client IP address.
+#
+#	Requests may pass through a chain of several other proxies
+#	before reaching us. The original source details may by sent in:
+#		* HTTP message Forwarded header, or
+#		* HTTP message X-Forwarded-For header, or
+#		* PROXY protocol connection header.
+#
+#	PROXY protocol connections are controlled by the proxy_protocol_access
+#	directive which is checked before this.
+#
+#	If a request reaches us from a source that is allowed by this
+#	directive, then we trust the information it provides regarding
+#	the IP of the client it received from (if any).
+#
+#	For the purpose of ACLs used in this directive the src ACL type always
+#	matches the address we are testing and srcdomain matches its rDNS.
+#
+#	On each HTTP request Squid checks for X-Forwarded-For header fields.
+#	If found the header values are iterated in reverse order and an allow
+#	match is required for Squid to continue on to the next value.
+#	The verification ends when a value receives a deny match, cannot be
+#	tested, or there are no more values to test.
+#	NOTE: Squid does not yet follow the Forwarded HTTP header.
+#
+#	The end result of this process is an IP address that we will
+#	refer to as the indirect client address.  This address may
+#	be treated as the client address for access control, ICAP, delay
+#	pools and logging, depending on the acl_uses_indirect_client,
+#	icap_uses_indirect_client, delay_pool_uses_indirect_client,
+#	log_uses_indirect_client and tproxy_uses_indirect_client options.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#	SECURITY CONSIDERATIONS:
+#
+#		Any host from which we accept client IP details can place
+#		incorrect information in the relevant header, and Squid
+#		will use the incorrect information as if it were the
+#		source address of the request.  This may enable remote
+#		hosts to bypass any access control restrictions that are
+#		based on the client's source addresses.
+#
+#	For example:
+#
+#		acl localhost src 127.0.0.1
+#		acl my_other_proxy srcdomain .proxy.example.com
+#		follow_x_forwarded_for allow localhost
+#		follow_x_forwarded_for allow my_other_proxy
+#Default:
+# X-Forwarded-For header will be ignored.
+
+#  TAG: acl_uses_indirect_client	on|off
+#	Controls whether the indirect client address
+#	(see follow_x_forwarded_for) is used instead of the
+#	direct client address in acl matching.
+#
+#	NOTE: maxconn ACL considers direct TCP links and indirect
+#	      clients will always have zero. So no match.
+#Default:
+# acl_uses_indirect_client on
+
+#  TAG: delay_pool_uses_indirect_client	on|off
+#	Controls whether the indirect client address
+#	(see follow_x_forwarded_for) is used instead of the
+#	direct client address in delay pools.
+#Default:
+# delay_pool_uses_indirect_client on
+
+#  TAG: log_uses_indirect_client	on|off
+#	Controls whether the indirect client address
+#	(see follow_x_forwarded_for) is used instead of the
+#	direct client address in the access log.
+#Default:
+# log_uses_indirect_client on
+
+#  TAG: tproxy_uses_indirect_client	on|off
+#	Controls whether the indirect client address
+#	(see follow_x_forwarded_for) is used instead of the
+#	direct client address when spoofing the outgoing client.
+#
+#	This has no effect on requests arriving in non-tproxy
+#	mode ports.
+#
+#	SECURITY WARNING: Usage of this option is dangerous
+#	and should not be used trivially. Correct configuration
+#	of follow_x_forwarded_for with a limited set of trusted
+#	sources is required to prevent abuse of your proxy.
+#Default:
+# tproxy_uses_indirect_client off
+
+#  TAG: spoof_client_ip
+#	Control client IP address spoofing of TPROXY traffic based on
+#	defined access lists.
+#
+#	spoof_client_ip allow|deny [!]aclname ...
+#
+#	If there are no "spoof_client_ip" lines present, the default
+#	is to "allow" spoofing of any suitable request.
+#
+#	Note that the cache_peer "no-tproxy" option overrides this ACL.
+#
+#	This clause supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow spoofing on all TPROXY traffic.
+
+#  TAG: http_access
+#	Allowing or Denying access based on defined access lists
+#
+#	To allow or deny a message received on an HTTP, HTTPS, or FTP port:
+#	http_access allow|deny [!]aclname ...
+#
+#	NOTE on default values:
+#
+#	If there are no "access" lines present, the default is to deny
+#	the request.
+#
+#	If none of the "access" lines cause a match, the default is the
+#	opposite of the last line in the list.  If the last line was
+#	deny, the default is allow.  Conversely, if the last line
+#	is allow, the default will be deny.  For these reasons, it is a
+#	good idea to have an "deny all" entry at the end of your access
+#	lists to avoid potential confusion.
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#Default:
+# Deny, unless rules exist in squid.conf.
+#
+
+#
+# Recommended minimum Access Permission configuration:
+#
+# Deny requests to certain unsafe ports
+http_access deny !Safe_ports
+
+# Deny CONNECT to other than secure SSL ports
+http_access deny CONNECT !SSL_ports
+
+# Only allow cachemgr access from localhost
+http_access allow localhost manager
+http_access deny manager
+
+# We strongly recommend the following be uncommented to protect innocent
+# web applications running on the proxy server who think the only
+# one who can access services on "localhost" is a local user
+#http_access deny to_localhost
+
+#
+# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
+#
+
+# Example rule allowing access from your local networks.
+# Adapt localnet in the ACL section to list your (internal) IP networks
+# from where browsing should be allowed
+http_access allow localnet
+http_access allow localhost
+
+# And finally deny all other access to this proxy
+http_access deny all
+
+#  TAG: adapted_http_access
+#	Allowing or Denying access based on defined access lists
+#
+#	Essentially identical to http_access, but runs after redirectors
+#	and ICAP/eCAP adaptation. Allowing access control based on their
+#	output.
+#
+#	If not set then only http_access is used.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: http_reply_access
+#	Allow replies to client requests. This is complementary to http_access.
+#
+#	http_reply_access allow|deny [!] aclname ...
+#
+#	NOTE: if there are no access lines present, the default is to allow
+#	all replies.
+#
+#	If none of the access lines cause a match the opposite of the
+#	last line will apply. Thus it is good practice to end the rules
+#	with an "allow all" or "deny all" entry.
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: icp_access
+#	Allowing or Denying access to the ICP port based on defined
+#	access lists
+#
+#	icp_access  allow|deny [!]aclname ...
+#
+#	NOTE: The default if no icp_access lines are present is to
+#	deny all traffic. This default may cause problems with peers
+#	using ICP.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+## Allow ICP queries from local networks only
+##icp_access allow localnet
+##icp_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: htcp_access
+#	Allowing or Denying access to the HTCP port based on defined
+#	access lists
+#
+#	htcp_access  allow|deny [!]aclname ...
+#
+#	See also htcp_clr_access for details on access control for
+#	cache purge (CLR) HTCP messages.
+#
+#	NOTE: The default if no htcp_access lines are present is to
+#	deny all traffic. This default may cause problems with peers
+#	using the htcp option.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+## Allow HTCP queries from local networks only
+##htcp_access allow localnet
+##htcp_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: htcp_clr_access
+#	Allowing or Denying access to purge content using HTCP based
+#	on defined access lists.
+#	See htcp_access for details on general HTCP access control.
+#
+#	htcp_clr_access  allow|deny [!]aclname ...
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+## Allow HTCP CLR requests from trusted peers
+#acl htcp_clr_peer src 192.0.2.2 2001:DB8::2
+#htcp_clr_access allow htcp_clr_peer
+#htcp_clr_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: miss_access
+#	Determines whether network access is permitted when satisfying a request.
+#
+#	For example;
+#	    to force your neighbors to use you as a sibling instead of
+#	    a parent.
+#
+#		acl localclients src 192.0.2.0/24 2001:DB8::a:0/64
+#		miss_access deny  !localclients
+#		miss_access allow all
+#
+#	This means only your local clients are allowed to fetch relayed/MISS
+#	replies from the network and all other clients can only fetch cached
+#	objects (HITs).
+#
+#	The default for this setting allows all clients who passed the
+#	http_access rules to relay via this proxy.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: ident_lookup_access
+#	A list of ACL elements which, if matched, cause an ident
+#	(RFC 931) lookup to be performed for this request.  For
+#	example, you might choose to always perform ident lookups
+#	for your main multi-user Unix boxes, but not for your Macs
+#	and PCs.  By default, ident lookups are not performed for
+#	any requests.
+#
+#	To enable ident lookups for specific client addresses, you
+#	can follow this example:
+#
+#	acl ident_aware_hosts src 198.168.1.0/24
+#	ident_lookup_access allow ident_aware_hosts
+#	ident_lookup_access deny all
+#
+#	Only src type ACL checks are fully supported.  A srcdomain
+#	ACL might work at times, but it will not always provide
+#	the correct result.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Unless rules exist in squid.conf, IDENT is not fetched.
+
+#  TAG: reply_body_max_size	size [acl acl...]
+#	This option specifies the maximum size of a reply body. It can be
+#	used to prevent users from downloading very large files, such as
+#	MP3's and movies. When the reply headers are received, the
+#	reply_body_max_size lines are processed, and the first line where
+#	all (if any) listed ACLs are true is used as the maximum body size
+#	for this reply.
+#
+#	This size is checked twice. First when we get the reply headers,
+#	we check the content-length value.  If the content length value exists
+#	and is larger than the allowed size, the request is denied and the
+#	user receives an error message that says "the request or reply
+#	is too large." If there is no content-length, and the reply
+#	size exceeds this limit, the client's connection is just closed
+#	and they will receive a partial reply.
+#
+#	WARNING: downstream caches probably can not detect a partial reply
+#	if there is no content-length header, so they will cache
+#	partial responses and give them out as hits.  You should NOT
+#	use this option if you have downstream caches.
+#
+#	WARNING: A maximum size smaller than the size of squid's error messages
+#	will cause an infinite loop and crash squid. Ensure that the smallest
+#	non-zero value you use is greater that the maximum header size plus
+#	the size of your largest error page.
+#
+#	If you set this parameter none (the default), there will be
+#	no limit imposed.
+#
+#	Configuration Format is:
+#		reply_body_max_size SIZE UNITS [acl ...]
+#	ie.
+#		reply_body_max_size 10 MB
+#
+#Default:
+# No limit is applied.
+
+# NETWORK OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: http_port
+#	Usage:	port [mode] [options]
+#		hostname:port [mode] [options]
+#		1.2.3.4:port [mode] [options]
+#
+#	The socket addresses where Squid will listen for HTTP client
+#	requests.  You may specify multiple socket addresses.
+#	There are three forms: port alone, hostname with port, and
+#	IP address with port.  If you specify a hostname or IP
+#	address, Squid binds the socket to that specific
+#	address. Most likely, you do not need to bind to a specific
+#	address, so you can use the port number alone.
+#
+#	If you are running Squid in accelerator mode, you
+#	probably want to listen on port 80 also, or instead.
+#
+#	The -a command line option may be used to specify additional
+#	port(s) where Squid listens for proxy request. Such ports will
+#	be plain proxy ports with no options.
+#
+#	You may specify multiple socket addresses on multiple lines.
+#
+#	Modes:
+#
+#	   intercept	Support for IP-Layer NAT interception delivering
+#			traffic to this Squid port.
+#			NP: disables authentication on the port.
+#
+#	   tproxy	Support Linux TPROXY (or BSD divert-to) with spoofing
+#			of outgoing connections using the client IP address.
+#			NP: disables authentication on the port.
+#
+#	   accel	Accelerator / reverse proxy mode
+#
+#	   ssl-bump	For each CONNECT request allowed by ssl_bump ACLs,
+#			establish secure connection with the client and with
+#			the server, decrypt HTTPS messages as they pass through
+#			Squid, and treat them as unencrypted HTTP messages,
+#			becoming the man-in-the-middle.
+#
+#			The ssl_bump option is required to fully enable
+#			bumping of CONNECT requests.
+#
+#	Omitting the mode flag causes default forward proxy mode to be used.
+#
+#
+#	Accelerator Mode Options:
+#
+#	   defaultsite=domainname
+#			What to use for the Host: header if it is not present
+#			in a request. Determines what site (not origin server)
+#			accelerators should consider the default.
+#
+#	   no-vhost	Disable using HTTP/1.1 Host header for virtual domain support.
+#
+#	   protocol=	Protocol to reconstruct accelerated and intercepted
+#			requests with. Defaults to HTTP/1.1 for http_port and
+#			HTTPS/1.1 for https_port.
+#			When an unsupported value is configured Squid will
+#			produce a FATAL error.
+#			Values: HTTP or HTTP/1.1, HTTPS or HTTPS/1.1
+#
+#	   vport	Virtual host port support. Using the http_port number
+#			instead of the port passed on Host: headers.
+#
+#	   vport=NN	Virtual host port support. Using the specified port
+#			number instead of the port passed on Host: headers.
+#
+#	   act-as-origin
+#			Act as if this Squid is the origin server.
+#			This currently means generate new Date: and Expires:
+#			headers on HIT instead of adding Age:.
+#
+#	   ignore-cc	Ignore request Cache-Control headers.
+#
+#			WARNING: This option violates HTTP specifications if
+#			used in non-accelerator setups.
+#
+#	   allow-direct	Allow direct forwarding in accelerator mode. Normally
+#			accelerated requests are denied direct forwarding as if
+#			never_direct was used.
+#
+#			WARNING: this option opens accelerator mode to security
+#			vulnerabilities usually only affecting in interception
+#			mode. Make sure to protect forwarding with suitable
+#			http_access rules when using this.
+#
+#
+#	SSL Bump Mode Options:
+#	    In addition to these options ssl-bump requires TLS/SSL options.
+#
+#	   generate-host-certificates[=<on|off>]
+#			Dynamically create SSL server certificates for the
+#			destination hosts of bumped CONNECT requests.When
+#			enabled, the cert and key options are used to sign
+#			generated certificates. Otherwise generated
+#			certificate will be selfsigned.
+#			If there is a CA certificate lifetime of the generated
+#			certificate equals lifetime of the CA certificate. If
+#			generated certificate is selfsigned lifetime is three
+#			years.
+#			This option is disabled by default. See the ssl-bump
+#			option above for more information.
+#
+#	   dynamic_cert_mem_cache_size=SIZE
+#			Approximate total RAM size spent on cached generated
+#			certificates. If set to zero, caching is disabled.
+#
+#	TLS / SSL Options:
+#
+#	   cert=	Path to SSL certificate (PEM format).
+#
+#	   key=		Path to SSL private key file (PEM format)
+#			if not specified, the certificate file is
+#			assumed to be a combined certificate and
+#			key file.
+#
+#	   version=	The version of SSL/TLS supported
+#			    1	automatic (default)
+#			    2	SSLv2 only
+#			    3	SSLv3 only
+#			    4	TLSv1.0 only
+#			    5	TLSv1.1 only
+#			    6	TLSv1.2 only
+#
+#	   cipher=	Colon separated list of supported ciphers.
+#			NOTE: some ciphers such as EDH ciphers depend on
+#			      additional settings. If those settings are
+#			      omitted the ciphers may be silently ignored
+#			      by the OpenSSL library.
+#
+#	   options=	Various SSL implementation options. The most important
+#			being:
+#			    NO_SSLv2    Disallow the use of SSLv2
+#			    NO_SSLv3    Disallow the use of SSLv3
+#			    NO_TLSv1    Disallow the use of TLSv1.0
+#			    NO_TLSv1_1  Disallow the use of TLSv1.1
+#			    NO_TLSv1_2  Disallow the use of TLSv1.2
+#			    SINGLE_DH_USE Always create a new key when using
+#				      temporary/ephemeral DH key exchanges
+#			    NO_TICKET Disables TLS tickets extension
+#
+#			    SINGLE_ECDH_USE
+#				      Enable ephemeral ECDH key exchange.
+#				      The adopted curve should be specified
+#				      using the tls-dh option.
+#
+#			    ALL       Enable various bug workarounds
+#				      suggested as "harmless" by OpenSSL
+#				      Be warned that this reduces SSL/TLS
+#				      strength to some attacks.
+#			See OpenSSL SSL_CTX_set_options documentation for a
+#			complete list of options.
+#
+#	   clientca=	File containing the list of CAs to use when
+#			requesting a client certificate.
+#
+#	   cafile=	File containing additional CA certificates to
+#			use when verifying client certificates. If unset
+#			clientca will be used.
+#
+#	   capath=	Directory containing additional CA certificates
+#			and CRL lists to use when verifying client certificates.
+#
+#	   crlfile=	File of additional CRL lists to use when verifying
+#			the client certificate, in addition to CRLs stored in
+#			the capath. Implies VERIFY_CRL flag below.
+#
+#	   tls-dh=[curve:]file
+#			File containing DH parameters for temporary/ephemeral DH key
+#			exchanges, optionally prefixed by a curve for ephemeral ECDH
+#			key exchanges.
+#			See OpenSSL documentation for details on how to create the
+#			DH parameter file. Supported curves for ECDH can be listed
+#			using the "openssl ecparam -list_curves" command.
+#			WARNING: EDH and EECDH ciphers will be silently disabled if
+#				 this option is not set.
+#
+#	   sslflags=	Various flags modifying the use of SSL:
+#			    DELAYED_AUTH
+#				Don't request client certificates
+#				immediately, but wait until acl processing
+#				requires a certificate (not yet implemented).
+#			    NO_DEFAULT_CA
+#				Don't use the default CA lists built in
+#				to OpenSSL.
+#			    NO_SESSION_REUSE
+#				Don't allow for session reuse. Each connection
+#				will result in a new SSL session.
+#			    VERIFY_CRL
+#				Verify CRL lists when accepting client
+#				certificates.
+#			    VERIFY_CRL_ALL
+#				Verify CRL lists for all certificates in the
+#				client certificate chain.
+#
+#	   sslcontext=	SSL session ID context identifier.
+#
+#	Other Options:
+#
+#	   connection-auth[=on|off]
+#	                use connection-auth=off to tell Squid to prevent
+#	                forwarding Microsoft connection oriented authentication
+#			(NTLM, Negotiate and Kerberos)
+#
+#	   disable-pmtu-discovery=
+#			Control Path-MTU discovery usage:
+#			    off		lets OS decide on what to do (default).
+#			    transparent	disable PMTU discovery when transparent
+#					support is enabled.
+#			    always	disable always PMTU discovery.
+#
+#			In many setups of transparently intercepting proxies
+#			Path-MTU discovery can not work on traffic towards the
+#			clients. This is the case when the intercepting device
+#			does not fully track connections and fails to forward
+#			ICMP must fragment messages to the cache server. If you
+#			have such setup and experience that certain clients
+#			sporadically hang or never complete requests set
+#			disable-pmtu-discovery option to 'transparent'.
+#
+#	   name=	Specifies a internal name for the port. Defaults to
+#			the port specification (port or addr:port)
+#
+#	   tcpkeepalive[=idle,interval,timeout]
+#			Enable TCP keepalive probes of idle connections.
+#			In seconds; idle is the initial time before TCP starts
+#			probing the connection, interval how often to probe, and
+#			timeout the time before giving up.
+#
+#	   require-proxy-header
+#			Require PROXY protocol version 1 or 2 connections.
+#			The proxy_protocol_access is required to whitelist
+#			downstream proxies which can be trusted.
+#
+#	If you run Squid on a dual-homed machine with an internal
+#	and an external interface we recommend you to specify the
+#	internal address:port in http_port. This way Squid will only be
+#	visible on the internal address.
+#
+#
+
+# Squid normally listens to port 3128
+http_port 3128
+
+#  TAG: https_port
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Usage:  [ip:]port cert=certificate.pem [key=key.pem] [mode] [options...]
+#
+#	The socket address where Squid will listen for client requests made
+#	over TLS or SSL connections. Commonly referred to as HTTPS.
+#
+#	This is most useful for situations where you are running squid in
+#	accelerator mode and you want to do the SSL work at the accelerator level.
+#
+#	You may specify multiple socket addresses on multiple lines,
+#	each with their own SSL certificate and/or options.
+#
+#	Modes:
+#
+#	   accel	Accelerator / reverse proxy mode
+#
+#	   intercept	Support for IP-Layer interception of
+#			outgoing requests without browser settings.
+#			NP: disables authentication and IPv6 on the port.
+#
+#	   tproxy	Support Linux TPROXY for spoofing outgoing
+#			connections using the client IP address.
+#			NP: disables authentication and maybe IPv6 on the port.
+#
+#	   ssl-bump	For each intercepted connection allowed by ssl_bump
+#			ACLs, establish a secure connection with the client and with
+#			the server, decrypt HTTPS messages as they pass through
+#			Squid, and treat them as unencrypted HTTP messages,
+#			becoming the man-in-the-middle.
+#
+#			An "ssl_bump server-first" match is required to
+#			fully enable bumping of intercepted SSL	connections.
+#
+#			Requires tproxy or intercept.
+#
+#	Omitting the mode flag causes default forward proxy mode to be used.
+#
+#
+#	See http_port for a list of generic options
+#
+#
+#	SSL Options:
+#
+#	   cert=	Path to SSL certificate (PEM format).
+#
+#	   key=		Path to SSL private key file (PEM format)
+#			if not specified, the certificate file is
+#			assumed to be a combined certificate and
+#			key file.
+#
+#	   version=	The version of SSL/TLS supported
+#			    1	automatic (default)
+#			    2	SSLv2 only
+#			    3	SSLv3 only
+#			    4	TLSv1 only
+#
+#	   cipher=	Colon separated list of supported ciphers.
+#
+#	   options=	Various SSL engine options. The most important
+#			being:
+#			    NO_SSLv2  Disallow the use of SSLv2
+#			    NO_SSLv3  Disallow the use of SSLv3
+#			    NO_TLSv1  Disallow the use of TLSv1
+#
+#			    SINGLE_DH_USE Always create a new key when using
+#				      temporary/ephemeral DH key exchanges
+#
+#			    SINGLE_ECDH_USE
+#				      Enable ephemeral ECDH key exchange.
+#				      The adopted curve should be specified
+#				      using the tls-dh option.
+#
+#			See src/ssl_support.c or OpenSSL SSL_CTX_set_options
+#			documentation for a complete list of options.
+#
+#	   clientca=	File containing the list of CAs to use when
+#			requesting a client certificate.
+#
+#	   cafile=	File containing additional CA certificates to
+#			use when verifying client certificates. If unset
+#			clientca will be used.
+#
+#	   capath=	Directory containing additional CA certificates
+#			and CRL lists to use when verifying client certificates.
+#
+#	   crlfile=	File of additional CRL lists to use when verifying
+#			the client certificate, in addition to CRLs stored in
+#			the capath. Implies VERIFY_CRL flag below.
+#
+#	   tls-dh=[curve:]file
+#			File containing DH parameters for temporary/ephemeral DH key
+#			exchanges, optionally prefixed by a curve for ephemeral ECDH
+#			key exchanges.
+#
+#	   sslflags=	Various flags modifying the use of SSL:
+#			    DELAYED_AUTH
+#				Don't request client certificates
+#				immediately, but wait until acl processing
+#				requires a certificate (not yet implemented).
+#			    NO_DEFAULT_CA
+#				Don't use the default CA lists built in
+#				to OpenSSL.
+#			    NO_SESSION_REUSE
+#				Don't allow for session reuse. Each connection
+#				will result in a new SSL session.
+#			    VERIFY_CRL
+#				Verify CRL lists when accepting client
+#				certificates.
+#			    VERIFY_CRL_ALL
+#				Verify CRL lists for all certificates in the
+#				client certificate chain.
+#
+#	   sslcontext=	SSL session ID context identifier.
+#
+#	   generate-host-certificates[=<on|off>]
+#			Dynamically create SSL server certificates for the
+#			destination hosts of bumped SSL requests.When
+#			enabled, the cert and key options are used to sign
+#			generated certificates. Otherwise generated
+#			certificate will be selfsigned.
+#			If there is CA certificate life time of generated
+#			certificate equals lifetime of CA certificate. If
+#			generated certificate is selfsigned lifetime is three
+#			years.
+#			This option is disabled by default. See the ssl-bump
+#			option above for more information.
+#
+#	   dynamic_cert_mem_cache_size=SIZE
+#			Approximate total RAM size spent on cached generated
+#			certificates. If set to zero, caching is disabled.
+#
+#	See http_port for a list of available options.
+#Default:
+# none
+
+#  TAG: ftp_port
+#	Enables Native FTP proxy by specifying the socket address where Squid
+#	listens for FTP client requests. See http_port directive for various
+#	ways to specify the listening address and mode.
+#
+#	Usage: ftp_port address [mode] [options]
+#
+#	WARNING: This is a new, experimental, complex feature that has seen
+#	limited production exposure. Some Squid modules (e.g., caching) do not
+#	currently work with native FTP proxying, and many features have not
+#	even been tested for compatibility. Test well before deploying!
+#
+#	Native FTP proxying differs substantially from proxying HTTP requests
+#	with ftp:// URIs because Squid works as an FTP server and receives
+#	actual FTP commands (rather than HTTP requests with FTP URLs).
+#
+#	Native FTP commands accepted at ftp_port are internally converted or
+#	wrapped into HTTP-like messages. The same happens to Native FTP
+#	responses received from FTP origin servers. Those HTTP-like messages
+#	are shoveled through regular access control and adaptation layers
+#	between the FTP client and the FTP origin server. This allows Squid to
+#	examine, adapt, block, and log FTP exchanges. Squid reuses most HTTP
+#	mechanisms when shoveling wrapped FTP messages. For example,
+#	http_access and adaptation_access directives are used.
+#
+#	Modes:
+#
+#	   intercept	Same as http_port intercept. The FTP origin address is
+#			determined based on the intended destination of the
+#			intercepted connection.
+#
+#	   tproxy	Support Linux TPROXY for spoofing outgoing
+#			connections using the client IP address.
+#			NP: disables authentication and maybe IPv6 on the port.
+#
+#	By default (i.e., without an explicit mode option), Squid extracts the
+#	FTP origin address from the login@origin parameter of the FTP USER
+#	command. Many popular FTP clients support such native FTP proxying.
+#
+#	Options:
+#
+#	   name=token	Specifies an internal name for the port. Defaults to
+#			the port address. Usable with myportname ACL.
+#
+#	   ftp-track-dirs
+#			Enables tracking of FTP directories by injecting extra
+#			PWD commands and adjusting Request-URI (in wrapping
+#			HTTP requests) to reflect the current FTP server
+#			directory. Tracking is disabled by default.
+#
+#	   protocol=FTP	Protocol to reconstruct accelerated and intercepted
+#			requests with. Defaults to FTP. No other accepted
+#			values have been tested with. An unsupported value
+#			results in a FATAL error. Accepted values are FTP,
+#			HTTP (or HTTP/1.1), and HTTPS (or HTTPS/1.1).
+#
+#	Other http_port modes and options that are not specific to HTTP and
+#	HTTPS may also work.
+#Default:
+# none
+
+#  TAG: tcp_outgoing_tos
+#	Allows you to select a TOS/Diffserv value for packets outgoing
+#	on the server side, based on an ACL.
+#
+#	tcp_outgoing_tos ds-field [!]aclname ...
+#
+#	Example where normal_service_net uses the TOS value 0x00
+#	and good_service_net uses 0x20
+#
+#	acl normal_service_net src 10.0.0.0/24
+#	acl good_service_net src 10.0.1.0/24
+#	tcp_outgoing_tos 0x00 normal_service_net
+#	tcp_outgoing_tos 0x20 good_service_net
+#
+#	TOS/DSCP values really only have local significance - so you should
+#	know what you're specifying. For more information, see RFC2474,
+#	RFC2475, and RFC3260.
+#
+#	The TOS/DSCP byte must be exactly that - a octet value  0 - 255, or
+#	"default" to use whatever default your host has.
+#	Note that only multiples of 4 are usable as the two rightmost bits have
+#	been redefined for use by ECN (RFC 3168 section 23.1).
+#	The squid parser will enforce this by masking away the ECN bits.
+#
+#	Processing proceeds in the order specified, and stops at first fully
+#	matching line.
+#
+#	Only fast ACLs are supported.
+#Default:
+# none
+
+#  TAG: clientside_tos
+#	Allows you to select a TOS/DSCP value for packets being transmitted
+#	on the client-side, based on an ACL.
+#
+#	clientside_tos ds-field [!]aclname ...
+#
+#	Example where normal_service_net uses the TOS value 0x00
+#	and good_service_net uses 0x20
+#
+#	acl normal_service_net src 10.0.0.0/24
+#	acl good_service_net src 10.0.1.0/24
+#	clientside_tos 0x00 normal_service_net
+#	clientside_tos 0x20 good_service_net
+#
+#	Note: This feature is incompatible with qos_flows. Any TOS values set here
+#	will be overwritten by TOS values in qos_flows.
+#
+#	The TOS/DSCP byte must be exactly that - a octet value  0 - 255, or
+#	"default" to use whatever default your host has.
+#	Note that only multiples of 4 are usable as the two rightmost bits have
+#	been redefined for use by ECN (RFC 3168 section 23.1).
+#	The squid parser will enforce this by masking away the ECN bits.
+#
+#Default:
+# none
+
+#  TAG: tcp_outgoing_mark
+# Note: This option is only available if Squid is rebuilt with the
+#       Packet MARK (Linux)
+#
+#	Allows you to apply a Netfilter mark value to outgoing packets
+#	on the server side, based on an ACL.
+#
+#	tcp_outgoing_mark mark-value [!]aclname ...
+#
+#	Example where normal_service_net uses the mark value 0x00
+#	and good_service_net uses 0x20
+#
+#	acl normal_service_net src 10.0.0.0/24
+#	acl good_service_net src 10.0.1.0/24
+#	tcp_outgoing_mark 0x00 normal_service_net
+#	tcp_outgoing_mark 0x20 good_service_net
+#
+#	Only fast ACLs are supported.
+#Default:
+# none
+
+#  TAG: clientside_mark
+# Note: This option is only available if Squid is rebuilt with the
+#       Packet MARK (Linux)
+#
+#	Allows you to apply a Netfilter mark value to packets being transmitted
+#	on the client-side, based on an ACL.
+#
+#	clientside_mark mark-value [!]aclname ...
+#
+#	Example where normal_service_net uses the mark value 0x00
+#	and good_service_net uses 0x20
+#
+#	acl normal_service_net src 10.0.0.0/24
+#	acl good_service_net src 10.0.1.0/24
+#	clientside_mark 0x00 normal_service_net
+#	clientside_mark 0x20 good_service_net
+#
+#	Note: This feature is incompatible with qos_flows. Any mark values set here
+#	will be overwritten by mark values in qos_flows.
+#Default:
+# none
+
+#  TAG: qos_flows
+#	Allows you to select a TOS/DSCP value to mark outgoing
+#	connections to the client, based on where the reply was sourced.
+#	For platforms using netfilter, allows you to set a netfilter mark
+#	value instead of, or in addition to, a TOS value.
+#
+#	By default this functionality is disabled. To enable it with the default
+#	settings simply use "qos_flows mark" or "qos_flows tos". Default
+#	settings will result in the netfilter mark or TOS value being copied
+#	from the upstream connection to the client. Note that it is the connection
+#	CONNMARK value not the packet MARK value that is copied.
+#
+#	It is not currently possible to copy the mark or TOS value from the
+#	client to the upstream connection request.
+#
+#	TOS values really only have local significance - so you should
+#	know what you're specifying. For more information, see RFC2474,
+#	RFC2475, and RFC3260.
+#
+#	The TOS/DSCP byte must be exactly that - a octet value  0 - 255.
+#	Note that only multiples of 4 are usable as the two rightmost bits have
+#	been redefined for use by ECN (RFC 3168 section 23.1).
+#	The squid parser will enforce this by masking away the ECN bits.
+#
+#	Mark values can be any unsigned 32-bit integer value.
+#
+#	This setting is configured by setting the following values:
+#
+#	tos|mark                Whether to set TOS or netfilter mark values
+#
+#	local-hit=0xFF		Value to mark local cache hits.
+#
+#	sibling-hit=0xFF	Value to mark hits from sibling peers.
+#
+#	parent-hit=0xFF		Value to mark hits from parent peers.
+#
+#	miss=0xFF[/mask]	Value to mark cache misses. Takes precedence
+#				over the preserve-miss feature (see below), unless
+#				mask is specified, in which case only the bits
+#				specified in the mask are written.
+#
+#	The TOS variant of the following features are only possible on Linux
+#	and require your kernel to be patched with the TOS preserving ZPH
+#	patch, available from http://zph.bratcheda.org
+#	No patch is needed to preserve the netfilter mark, which will work
+#	with all variants of netfilter.
+#
+#	disable-preserve-miss
+#		This option disables the preservation of the TOS or netfilter
+#		mark. By default, the existing TOS or netfilter mark value of
+#		the response coming from the remote server will be retained
+#		and masked with miss-mark.
+#		NOTE: in the case of a netfilter mark, the mark must be set on
+#		the connection (using the CONNMARK target) not on the packet
+#		(MARK target).
+#
+#	miss-mask=0xFF
+#		Allows you to mask certain bits in the TOS or mark value
+#		received from the remote server, before copying the value to
+#		the TOS sent towards clients.
+#		Default for tos: 0xFF (TOS from server is not changed).
+#		Default for mark: 0xFFFFFFFF (mark from server is not changed).
+#
+#	All of these features require the --enable-zph-qos compilation flag
+#	(enabled by default). Netfilter marking also requires the
+#	libnetfilter_conntrack libraries (--with-netfilter-conntrack) and
+#	libcap 2.09+ (--with-libcap).
+#
+#Default:
+# none
+
+#  TAG: tcp_outgoing_address
+#	Allows you to map requests to different outgoing IP addresses
+#	based on the username or source address of the user making
+#	the request.
+#
+#	tcp_outgoing_address ipaddr [[!]aclname] ...
+#
+#	For example;
+#		Forwarding clients with dedicated IPs for certain subnets.
+#
+#	  acl normal_service_net src 10.0.0.0/24
+#	  acl good_service_net src 10.0.2.0/24
+#
+#	  tcp_outgoing_address 2001:db8::c001 good_service_net
+#	  tcp_outgoing_address 10.1.0.2 good_service_net
+#
+#	  tcp_outgoing_address 2001:db8::beef normal_service_net
+#	  tcp_outgoing_address 10.1.0.1 normal_service_net
+#
+#	  tcp_outgoing_address 2001:db8::1
+#	  tcp_outgoing_address 10.1.0.3
+#
+#	Processing proceeds in the order specified, and stops at first fully
+#	matching line.
+#
+#	Squid will add an implicit IP version test to each line.
+#	Requests going to IPv4 websites will use the outgoing 10.1.0.* addresses.
+#	Requests going to IPv6 websites will use the outgoing 2001:db8:* addresses.
+#
+#
+#	NOTE: The use of this directive using client dependent ACLs is
+#	incompatible with the use of server side persistent connections. To
+#	ensure correct results it is best to set server_persistent_connections
+#	to off when using this directive in such configurations.
+#
+#	NOTE: The use of this directive to set a local IP on outgoing TCP links
+#	is incompatible with using TPROXY to set client IP out outbound TCP links.
+#	When needing to contact peers use the no-tproxy cache_peer option and the
+#	client_dst_passthru directive re-enable normal forwarding such as this.
+#
+#Default:
+# Address selection is performed by the operating system.
+
+#  TAG: host_verify_strict
+#	Regardless of this option setting, when dealing with intercepted
+#	traffic, Squid always verifies that the destination IP address matches
+#	the Host header domain or IP (called 'authority form URL').
+#
+#	This enforcement is performed to satisfy a MUST-level requirement in
+#	RFC 2616 section 14.23: "The Host field value MUST represent the naming
+#	authority of the origin server or gateway given by the original URL".
+#
+#	When set to ON:
+#		Squid always responds with an HTTP 409 (Conflict) error
+#		page and logs a security warning if there is no match.
+#
+#		Squid verifies that the destination IP address matches
+#		the Host header for forward-proxy and reverse-proxy traffic
+#		as well. For those traffic types, Squid also enables the
+#		following checks, comparing the corresponding Host header
+#		and Request-URI components:
+#
+#		 * The host names (domain or IP) must be identical,
+#		   but valueless or missing Host header disables all checks.
+#		   For the two host names to match, both must be either IP
+#		   or FQDN.
+#
+#		 * Port numbers must be identical, but if a port is missing
+#		   the scheme-default port is assumed.
+#
+#
+#	When set to OFF (the default):
+#		Squid allows suspicious requests to continue but logs a
+#		security warning and blocks caching of the response.
+#
+#		 * Forward-proxy traffic is not checked at all.
+#
+#		 * Reverse-proxy traffic is not checked at all.
+#
+#		 * Intercepted traffic which passes verification is handled
+#		   according to client_dst_passthru.
+#
+#		 * Intercepted requests which fail verification are sent
+#		   to the client original destination instead of DIRECT.
+#		   This overrides 'client_dst_passthru off'.
+#
+#		For now suspicious intercepted CONNECT requests are always
+#		responded to with an HTTP 409 (Conflict) error page.
+#
+#
+#	SECURITY NOTE:
+#
+#	As described in CVE-2009-0801 when the Host: header alone is used
+#	to determine the destination of a request it becomes trivial for
+#	malicious scripts on remote websites to bypass browser same-origin
+#	security policy and sandboxing protections.
+#
+#	The cause of this is that such applets are allowed to perform their
+#	own HTTP stack, in which case the same-origin policy of the browser
+#	sandbox only verifies that the applet tries to contact the same IP
+#	as from where it was loaded at the IP level. The Host: header may
+#	be different from the connected IP and approved origin.
+#
+#Default:
+# host_verify_strict off
+
+#  TAG: client_dst_passthru
+#	With NAT or TPROXY intercepted traffic Squid may pass the request
+#	directly to the original client destination IP or seek a faster
+#	source using the HTTP Host header.
+#
+#	Using Host to locate alternative servers can provide faster
+#	connectivity with a range of failure recovery options.
+#	But can also lead to connectivity trouble when the client and
+#	server are attempting stateful interactions unaware of the proxy.
+#
+#	This option (on by default) prevents alternative DNS entries being
+#	located to send intercepted traffic DIRECT to an origin server.
+#	The clients original destination IP and port will be used instead.
+#
+#	Regardless of this option setting, when dealing with intercepted
+#	traffic Squid will verify the Host: header and any traffic which
+#	fails Host verification will be treated as if this option were ON.
+#
+#	see host_verify_strict for details on the verification process.
+#Default:
+# client_dst_passthru on
+
+# SSL OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: ssl_unclean_shutdown
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Some browsers (especially MSIE) bugs out on SSL shutdown
+#	messages.
+#Default:
+# ssl_unclean_shutdown off
+
+#  TAG: ssl_engine
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	The OpenSSL engine to use. You will need to set this if you
+#	would like to use hardware SSL acceleration for example.
+#Default:
+# none
+
+#  TAG: sslproxy_client_certificate
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Client SSL Certificate to use when proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_client_key
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Client SSL Key to use when proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_version
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	SSL version level to use when proxying https:// URLs
+#
+#	The versions of SSL/TLS supported:
+#
+#	    1	automatic (default)
+#	    2	SSLv2 only
+#	    3	SSLv3 only
+#	    4	TLSv1.0 only
+#	    5	TLSv1.1 only
+#	    6	TLSv1.2 only
+#Default:
+# automatic SSL/TLS version negotiation
+
+#  TAG: sslproxy_options
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Colon (:) or comma (,) separated list of SSL implementation options
+#	to use when proxying https:// URLs
+#
+#	The most important being:
+#
+#	    NO_SSLv2    Disallow the use of SSLv2
+#	    NO_SSLv3    Disallow the use of SSLv3
+#	    NO_TLSv1    Disallow the use of TLSv1.0
+#	    NO_TLSv1_1  Disallow the use of TLSv1.1
+#	    NO_TLSv1_2  Disallow the use of TLSv1.2
+#
+#	    SINGLE_DH_USE
+#		      Always create a new key when using temporary/ephemeral
+#		      DH key exchanges
+#
+#	    NO_TICKET
+#		      Disable use of RFC5077 session tickets. Some servers
+#		      may have problems understanding the TLS extension due
+#		      to ambiguous specification in RFC4507.
+#
+#	    ALL       Enable various bug workarounds suggested as "harmless"
+#		      by OpenSSL. Be warned that this may reduce SSL/TLS
+#		      strength to some attacks.
+#
+#	See the OpenSSL SSL_CTX_set_options documentation for a
+#	complete list of possible options.
+#
+#	WARNING: This directive takes a single token. If a space is used
+#		 the value(s) after that space are SILENTLY IGNORED.
+#Default:
+# none
+
+#  TAG: sslproxy_cipher
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	SSL cipher list to use when proxying https:// URLs
+#
+#	Colon separated list of supported ciphers.
+#Default:
+# none
+
+#  TAG: sslproxy_cafile
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	file containing CA certificates to use when verifying server
+#	certificates while proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_capath
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	directory containing CA certificates to use when verifying
+#	server certificates while proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_session_ttl
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Sets the timeout value for SSL sessions
+#Default:
+# sslproxy_session_ttl 300
+
+#  TAG: sslproxy_session_cache_size
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#        Sets the cache size to use for ssl session
+#Default:
+# sslproxy_session_cache_size 2 MB
+
+#  TAG: sslproxy_foreign_intermediate_certs
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Many origin servers fail to send their full server certificate
+#	chain for verification, assuming the client already has or can
+#	easily locate any missing intermediate certificates.
+#
+#	Squid uses the certificates from the specified file to fill in
+#	these missing chains when trying to validate origin server
+#	certificate chains.
+#
+#	The file is expected to contain zero or more PEM-encoded
+#	intermediate certificates. These certificates are not treated
+#	as trusted root certificates, and any self-signed certificate in
+#	this file will be ignored.
+#Default:
+# none
+
+#  TAG: sslproxy_cert_sign_hash
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Sets the hashing algorithm to use when signing generated certificates.
+#	Valid algorithm names depend on the OpenSSL library used. The following
+#	names are usually available: sha1, sha256, sha512, and md5. Please see
+#	your OpenSSL library manual for the available hashes. By default, Squids
+#	that support this option use sha256 hashes.
+#
+#	Squid does not forcefully purge cached certificates that were generated
+#	with an algorithm other than the currently configured one. They remain
+#	in the cache, subject to the regular cache eviction policy, and become
+#	useful if the algorithm changes again.
+#Default:
+# none
+
+#  TAG: ssl_bump
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	This option is consulted when a CONNECT request is received on
+#	an http_port (or a new connection is intercepted at an
+#	https_port), provided that port was configured with an ssl-bump
+#	flag. The subsequent data on the connection is either treated as
+#	HTTPS and decrypted OR tunneled at TCP level without decryption,
+#	depending on the first matching bumping "action".
+#
+#	ssl_bump <action> [!]acl ...
+#
+#	The following bumping actions are currently supported:
+#
+#	    splice
+#		Become a TCP tunnel without decrypting proxied traffic.
+#		This is the default action.
+#
+#	    bump
+#		When used on step SslBump1, establishes a secure connection
+#		with the client first, then connect to the server.
+#		When used on step SslBump2 or SslBump3, establishes a secure
+#		connection with the server and, using a mimicked server
+#		certificate, with the client.
+#
+#	    peek
+#		Receive client (step SslBump1) or server (step SslBump2)
+#		certificate while preserving the possibility of splicing the
+#		connection. Peeking at the server certificate (during step 2)
+#		usually precludes bumping of the connection at step 3.
+#
+#	    stare
+#		Receive client (step SslBump1) or server (step SslBump2)
+#		certificate while preserving the possibility of bumping the
+#		connection. Staring at the server certificate (during step 2)
+#		usually precludes splicing of the connection at step 3.
+#
+#	    terminate
+#		Close client and server connections.
+#
+#	Backward compatibility actions available at step SslBump1:
+#
+#	    client-first
+#		Bump the connection. Establish a secure connection with the
+#		client first, then connect to the server. This old mode does
+#		not allow Squid to mimic server SSL certificate and does not
+#		work with intercepted SSL connections.
+#
+#	    server-first
+#		Bump the connection. Establish a secure connection with the
+#		server first, then establish a secure connection with the
+#		client, using a mimicked server certificate. Works with both
+#		CONNECT requests and intercepted SSL connections, but does
+#		not allow to make decisions based on SSL handshake info.
+#
+#	    peek-and-splice
+#		Decide whether to bump or splice the connection based on
+#		client-to-squid and server-to-squid SSL hello messages.
+#		XXX: Remove.
+#
+#	    none
+#		Same as the "splice" action.
+#
+#	All ssl_bump rules are evaluated at each of the supported bumping
+#	steps.  Rules with actions that are impossible at the current step are
+#	ignored. The first matching ssl_bump action wins and is applied at the
+#	end of the current step. If no rules match, the splice action is used.
+#	See the at_step ACL for a list of the supported SslBump steps.
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#	See also: http_port ssl-bump, https_port ssl-bump, and acl at_step.
+#
+#
+#	# Example: Bump all TLS connections except those originating from
+#	# localhost or those going to example.com.
+#
+#	acl broken_sites ssl::server_name .example.com
+#	ssl_bump splice localhost
+#	ssl_bump splice broken_sites
+#	ssl_bump bump all
+#Default:
+# Become a TCP tunnel without decrypting proxied traffic.
+
+#  TAG: sslproxy_flags
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Various flags modifying the use of SSL while proxying https:// URLs:
+#	    DONT_VERIFY_PEER	Accept certificates that fail verification.
+#				For refined control, see sslproxy_cert_error.
+#	    NO_DEFAULT_CA	Don't use the default CA list built in
+#				to OpenSSL.
+#Default:
+# none
+
+#  TAG: sslproxy_cert_error
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Use this ACL to bypass server certificate validation errors.
+#
+#	For example, the following lines will bypass all validation errors
+#	when talking to servers for example.com. All other
+#	validation errors will result in ERR_SECURE_CONNECT_FAIL error.
+#
+#		acl BrokenButTrustedServers dstdomain example.com
+#		sslproxy_cert_error allow BrokenButTrustedServers
+#		sslproxy_cert_error deny all
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#	Using slow acl types may result in server crashes
+#
+#	Without this option, all server certificate validation errors
+#	terminate the transaction to protect Squid and the client.
+#
+#	SQUID_X509_V_ERR_INFINITE_VALIDATION error cannot be bypassed
+#	but should not happen unless your OpenSSL library is buggy.
+#
+#	SECURITY WARNING:
+#		Bypassing validation errors is dangerous because an
+#		error usually implies that the server cannot be trusted
+#		and the connection may be insecure.
+#
+#	See also: sslproxy_flags and DONT_VERIFY_PEER.
+#Default:
+# Server certificate errors terminate the transaction.
+
+#  TAG: sslproxy_cert_sign
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#
+#        sslproxy_cert_sign <signing algorithm> acl ...
+#
+#        The following certificate signing algorithms are supported:
+#
+#	   signTrusted
+#		Sign using the configured CA certificate which is usually
+#		placed in and trusted by end-user browsers. This is the
+#		default for trusted origin server certificates.
+#
+#	   signUntrusted
+#		Sign to guarantee an X509_V_ERR_CERT_UNTRUSTED browser error.
+#		This is the default for untrusted origin server certificates
+#		that are not self-signed (see ssl::certUntrusted).
+#
+#	   signSelf
+#		Sign using a self-signed certificate with the right CN to
+#		generate a X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT error in the
+#		browser. This is the default for self-signed origin server
+#		certificates (see ssl::certSelfSigned).
+#
+#	This clause only supports fast acl types.
+#
+#	When sslproxy_cert_sign acl(s) match, Squid uses the corresponding
+#	signing algorithm to generate the certificate and ignores all
+#	subsequent sslproxy_cert_sign options (the first match wins). If no
+#	acl(s) match, the default signing algorithm is determined by errors
+#	detected when obtaining and validating the origin server certificate.
+#
+#	WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
+#	be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
+#	CONNECT request that carries a domain name. In all other cases (CONNECT
+#	to an IP address or an intercepted SSL connection), Squid cannot detect
+#	the domain mismatch at certificate generation time when
+#	bump-server-first is used.
+#Default:
+# none
+
+#  TAG: sslproxy_cert_adapt
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#
+#	sslproxy_cert_adapt <adaptation algorithm> acl ...
+#
+#	The following certificate adaptation algorithms are supported:
+#
+#	   setValidAfter
+#		Sets the "Not After" property to the "Not After" property of
+#		the CA certificate used to sign generated certificates.
+#
+#	   setValidBefore
+#		Sets the "Not Before" property to the "Not Before" property of
+#		the CA certificate used to sign generated certificates.
+#
+#	   setCommonName or setCommonName{CN}
+#		Sets Subject.CN property to the host name specified as a
+#		CN parameter or, if no explicit CN parameter was specified,
+#		extracted from the CONNECT request. It is a misconfiguration
+#		to use setCommonName without an explicit parameter for
+#		intercepted or tproxied SSL connections.
+#
+#	This clause only supports fast acl types.
+#
+#	Squid first groups sslproxy_cert_adapt options by adaptation algorithm.
+#	Within a group, when sslproxy_cert_adapt acl(s) match, Squid uses the
+#	corresponding adaptation algorithm to generate the certificate and
+#	ignores all subsequent sslproxy_cert_adapt options in that algorithm's
+#	group (i.e., the first match wins within each algorithm group). If no
+#	acl(s) match, the default mimicking action takes place.
+#
+#	WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
+#	be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
+#	CONNECT request that carries a domain name. In all other cases (CONNECT
+#	to an IP address or an intercepted SSL connection), Squid cannot detect
+#	the domain mismatch at certificate generation time when
+#	bump-server-first is used.
+#Default:
+# none
+
+#  TAG: sslpassword_program
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Specify a program used for entering SSL key passphrases
+#	when using encrypted SSL certificate keys. If not specified
+#	keys must either be unencrypted, or Squid started with the -N
+#	option to allow it to query interactively for the passphrase.
+#
+#	The key file name is given as argument to the program allowing
+#	selection of the right password if you have multiple encrypted
+#	keys.
+#Default:
+# none
+
+# OPTIONS RELATING TO EXTERNAL SSL_CRTD
+# -----------------------------------------------------------------------------
+
+#  TAG: sslcrtd_program
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl-crtd
+#
+#	Specify the location and options of the executable for ssl_crtd process.
+#	/usr/lib/squid/ssl_crtd program requires -s and -M parameters
+#	For more information use:
+#		/usr/lib/squid/ssl_crtd -h
+#Default:
+# sslcrtd_program /usr/lib/squid/ssl_crtd -s /var/lib/ssl_db -M 4MB
+
+#  TAG: sslcrtd_children
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl-crtd
+#
+#	The maximum number of processes spawn to service ssl server.
+#	The maximum this may be safely set to is 32.
+#
+#	The startup= and idle= options allow some measure of skew in your
+#	tuning.
+#
+#		startup=N
+#
+#	Sets the minimum number of processes to spawn when Squid
+#	starts or reconfigures. When set to zero the first request will
+#	cause spawning of the first child process to handle it.
+#
+#	Starting too few children temporary slows Squid under load while it
+#	tries to spawn enough additional processes to cope with traffic.
+#
+#		idle=N
+#
+#	Sets a minimum of how many processes Squid is to try and keep available
+#	at all times. When traffic begins to rise above what the existing
+#	processes can handle this many more will be spawned up to the maximum
+#	configured. A minimum setting of 1 is required.
+#
+#	You must have at least one ssl_crtd process.
+#Default:
+# sslcrtd_children 32 startup=5 idle=1
+
+#  TAG: sslcrtvalidator_program
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	Specify the location and options of the executable for ssl_crt_validator
+#	process.
+#
+#	Usage:  sslcrtvalidator_program [ttl=n] [cache=n] path ...
+#
+#	Options:
+#	  ttl=n         TTL in seconds for cached results. The default is 60 secs
+#	  cache=n       limit the result cache size. The default value is 2048
+#Default:
+# none
+
+#  TAG: sslcrtvalidator_children
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#	The maximum number of processes spawn to service SSL server.
+#	The maximum this may be safely set to is 32.
+#
+#	The startup= and idle= options allow some measure of skew in your
+#	tuning.
+#
+#		startup=N
+#
+#	Sets the minimum number of processes to spawn when Squid
+#	starts or reconfigures. When set to zero the first request will
+#	cause spawning of the first child process to handle it.
+#
+#	Starting too few children temporary slows Squid under load while it
+#	tries to spawn enough additional processes to cope with traffic.
+#
+#		idle=N
+#
+#	Sets a minimum of how many processes Squid is to try and keep available
+#	at all times. When traffic begins to rise above what the existing
+#	processes can handle this many more will be spawned up to the maximum
+#	configured. A minimum setting of 1 is required.
+#
+#		concurrency=
+#
+#	The number of requests each certificate validator helper can handle in
+#	parallel. A value of 0 indicates the certficate validator does not
+#	support concurrency. Defaults to 1.
+#
+#	When this directive is set to a value >= 1 then the protocol
+#	used to communicate with the helper is modified to include
+#	a request ID in front of the request/response. The request
+#	ID from the request must be echoed back with the response
+#	to that request.
+#
+#	You must have at least one ssl_crt_validator process.
+#Default:
+# sslcrtvalidator_children 32 startup=5 idle=1 concurrency=1
+
+# OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_peer
+#	To specify other caches in a hierarchy, use the format:
+#
+#		cache_peer hostname type http-port icp-port [options]
+#
+#	For example,
+#
+#	#                                        proxy  icp
+#	#          hostname             type     port   port  options
+#	#          -------------------- -------- ----- -----  -----------
+#	cache_peer parent.foo.net       parent    3128  3130  default
+#	cache_peer sib1.foo.net         sibling   3128  3130  proxy-only
+#	cache_peer sib2.foo.net         sibling   3128  3130  proxy-only
+#	cache_peer example.com          parent    80       0  default
+#	cache_peer cdn.example.com      sibling   3128     0
+#
+#	      type:	either 'parent', 'sibling', or 'multicast'.
+#
+#	proxy-port:	The port number where the peer accept HTTP requests.
+#			For other Squid proxies this is usually 3128
+#			For web servers this is usually 80
+#
+#	  icp-port:	Used for querying neighbor caches about objects.
+#			Set to 0 if the peer does not support ICP or HTCP.
+#			See ICP and HTCP options below for additional details.
+#
+#
+#	==== ICP OPTIONS ====
+#
+#	You MUST also set icp_port and icp_access explicitly when using these options.
+#	The defaults will prevent peer traffic using ICP.
+#
+#
+#	no-query	Disable ICP queries to this neighbor.
+#
+#	multicast-responder
+#			Indicates the named peer is a member of a multicast group.
+#			ICP queries will not be sent directly to the peer, but ICP
+#			replies will be accepted from it.
+#
+#	closest-only	Indicates that, for ICP_OP_MISS replies, we'll only forward
+#			CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes.
+#
+#	background-ping
+#			To only send ICP queries to this neighbor infrequently.
+#			This is used to keep the neighbor round trip time updated
+#			and is usually used in conjunction with weighted-round-robin.
+#
+#
+#	==== HTCP OPTIONS ====
+#
+#	You MUST also set htcp_port and htcp_access explicitly when using these options.
+#	The defaults will prevent peer traffic using HTCP.
+#
+#
+#	htcp		Send HTCP, instead of ICP, queries to the neighbor.
+#			You probably also want to set the "icp-port" to 4827
+#			instead of 3130. This directive accepts a comma separated
+#			list of options described below.
+#
+#	htcp=oldsquid	Send HTCP to old Squid versions (2.5 or earlier).
+#
+#	htcp=no-clr	Send HTCP to the neighbor but without
+#			sending any CLR requests.  This cannot be used with
+#			only-clr.
+#
+#	htcp=only-clr	Send HTCP to the neighbor but ONLY CLR requests.
+#			This cannot be used with no-clr.
+#
+#	htcp=no-purge-clr
+#			Send HTCP to the neighbor including CLRs but only when
+#			they do not result from PURGE requests.
+#
+#	htcp=forward-clr
+#			Forward any HTCP CLR requests this proxy receives to the peer.
+#
+#
+#	==== PEER SELECTION METHODS ====
+#
+#	The default peer selection method is ICP, with the first responding peer
+#	being used as source. These options can be used for better load balancing.
+#
+#
+#	default		This is a parent cache which can be used as a "last-resort"
+#			if a peer cannot be located by any of the peer-selection methods.
+#			If specified more than once, only the first is used.
+#
+#	round-robin	Load-Balance parents which should be used in a round-robin
+#			fashion in the absence of any ICP queries.
+#			weight=N can be used to add bias.
+#
+#	weighted-round-robin
+#			Load-Balance parents which should be used in a round-robin
+#			fashion with the frequency of each parent being based on the
+#			round trip time. Closer parents are used more often.
+#			Usually used for background-ping parents.
+#			weight=N can be used to add bias.
+#
+#	carp		Load-Balance parents which should be used as a CARP array.
+#			The requests will be distributed among the parents based on the
+#			CARP load balancing hash function based on their weight.
+#
+#	userhash	Load-balance parents based on the client proxy_auth or ident username.
+#
+#	sourcehash	Load-balance parents based on the client source IP.
+#
+#	multicast-siblings
+#			To be used only for cache peers of type "multicast".
+#			ALL members of this multicast group have "sibling"
+#			relationship with it, not "parent".  This is to a multicast
+#			group when the requested object would be fetched only from
+#			a "parent" cache, anyway.  It's useful, e.g., when
+#			configuring a pool of redundant Squid proxies, being
+#			members of the same multicast group.
+#
+#
+#	==== PEER SELECTION OPTIONS ====
+#
+#	weight=N	use to affect the selection of a peer during any weighted
+#			peer-selection mechanisms.
+#			The weight must be an integer; default is 1,
+#			larger weights are favored more.
+#			This option does not affect parent selection if a peering
+#			protocol is not in use.
+#
+#	basetime=N	Specify a base amount to be subtracted from round trip
+#			times of parents.
+#			It is subtracted before division by weight in calculating
+#			which parent to fectch from. If the rtt is less than the
+#			base time the rtt is set to a minimal value.
+#
+#	ttl=N		Specify a TTL to use when sending multicast ICP queries
+#			to this address.
+#			Only useful when sending to a multicast group.
+#			Because we don't accept ICP replies from random
+#			hosts, you must configure other group members as
+#			peers with the 'multicast-responder' option.
+#
+#	no-delay	To prevent access to this neighbor from influencing the
+#			delay pools.
+#
+#	digest-url=URL	Tell Squid to fetch the cache digest (if digests are
+#			enabled) for this host from the specified URL rather
+#			than the Squid default location.
+#
+#
+#	==== CARP OPTIONS ====
+#
+#	carp-key=key-specification
+#			use a different key than the full URL to hash against the peer.
+#			the key-specification is a comma-separated list of the keywords
+#			scheme, host, port, path, params
+#			Order is not important.
+#
+#	==== ACCELERATOR / REVERSE-PROXY OPTIONS ====
+#
+#	originserver	Causes this parent to be contacted as an origin server.
+#			Meant to be used in accelerator setups when the peer
+#			is a web server.
+#
+#	forceddomain=name
+#			Set the Host header of requests forwarded to this peer.
+#			Useful in accelerator setups where the server (peer)
+#			expects a certain domain name but clients may request
+#			others. ie example.com or www.example.com
+#
+#	no-digest	Disable request of cache digests.
+#
+#	no-netdb-exchange
+#			Disables requesting ICMP RTT database (NetDB).
+#
+#
+#	==== AUTHENTICATION OPTIONS ====
+#
+#	login=user:password
+#			If this is a personal/workgroup proxy and your parent
+#			requires proxy authentication.
+#
+#			Note: The string can include URL escapes (i.e. %20 for
+#			spaces). This also means % must be written as %%.
+#
+#	login=PASSTHRU
+#			Send login details received from client to this peer.
+#			Both Proxy- and WWW-Authorization headers are passed
+#			without alteration to the peer.
+#			Authentication is not required by Squid for this to work.
+#
+#			Note: This will pass any form of authentication but
+#			only Basic auth will work through a proxy unless the
+#			connection-auth options are also used.
+#
+#	login=PASS	Send login details received from client to this peer.
+#			Authentication is not required by this option.
+#
+#			If there are no client-provided authentication headers
+#			to pass on, but username and password are available
+#			from an external ACL user= and password= result tags
+#			they may be sent instead.
+#
+#			Note: To combine this with proxy_auth both proxies must
+#			share the same user database as HTTP only allows for
+#			a single login (one for proxy, one for origin server).
+#			Also be warned this will expose your users proxy
+#			password to the peer. USE WITH CAUTION
+#
+#	login=*:password
+#			Send the username to the upstream cache, but with a
+#			fixed password. This is meant to be used when the peer
+#			is in another administrative domain, but it is still
+#			needed to identify each user.
+#			The star can optionally be followed by some extra
+#			information which is added to the username. This can
+#			be used to identify this proxy to the peer, similar to
+#			the login=username:password option above.
+#
+#	login=NEGOTIATE
+#			If this is a personal/workgroup proxy and your parent
+#			requires a secure proxy authentication.
+#			The first principal from the default keytab or defined by
+#			the environment variable KRB5_KTNAME will be used.
+#
+#			WARNING: The connection may transmit requests from multiple
+#			clients. Negotiate often assumes end-to-end authentication
+#			and a single-client. Which is not strictly true here.
+#
+#	login=NEGOTIATE:principal_name
+#			If this is a personal/workgroup proxy and your parent
+#			requires a secure proxy authentication.
+#			The principal principal_name from the default keytab or
+#			defined by the environment variable KRB5_KTNAME will be
+#			used.
+#
+#			WARNING: The connection may transmit requests from multiple
+#			clients. Negotiate often assumes end-to-end authentication
+#			and a single-client. Which is not strictly true here.
+#
+#	connection-auth=on|off
+#			Tell Squid that this peer does or not support Microsoft
+#			connection oriented authentication, and any such
+#			challenges received from there should be ignored.
+#			Default is auto to automatically determine the status
+#			of the peer.
+#
+#
+#	==== SSL / HTTPS / TLS OPTIONS ====
+#
+#	ssl		Encrypt connections to this peer with SSL/TLS.
+#
+#	sslcert=/path/to/ssl/certificate
+#			A client SSL certificate to use when connecting to
+#			this peer.
+#
+#	sslkey=/path/to/ssl/key
+#			The private SSL key corresponding to sslcert above.
+#			If 'sslkey' is not specified 'sslcert' is assumed to
+#			reference a combined file containing both the
+#			certificate and the key.
+#
+#	Notes:
+#
+#	On Debian/Ubuntu systems a default snakeoil certificate is
+#    available in /etc/ssl and users can set:
+#
+#		cert=/etc/ssl/certs/ssl-cert-snakeoil.pem
+#
+#	and
+#
+#		key=/etc/ssl/private/ssl-cert-snakeoil.key
+#
+#	for testing.
+#
+#	sslversion=1|2|3|4|5|6
+#			The SSL version to use when connecting to this peer
+#				1 = automatic (default)
+#				2 = SSL v2 only
+#				3 = SSL v3 only
+#				4 = TLS v1.0 only
+#				5 = TLS v1.1 only
+#				6 = TLS v1.2 only
+#
+#	sslcipher=...	The list of valid SSL ciphers to use when connecting
+#			to this peer.
+#
+#	ssloptions=... 	Specify various SSL implementation options:
+#
+#			    NO_SSLv2    Disallow the use of SSLv2
+#			    NO_SSLv3    Disallow the use of SSLv3
+#			    NO_TLSv1    Disallow the use of TLSv1.0
+#			    NO_TLSv1_1  Disallow the use of TLSv1.1
+#			    NO_TLSv1_2  Disallow the use of TLSv1.2
+#
+#			    SINGLE_DH_USE
+#				      Always create a new key when using
+#				      temporary/ephemeral DH key exchanges
+#
+#			    NO_TICKET
+#				      Disable use of RFC5077 session tickets. Some servers
+#				      may have problems understanding the TLS extension due
+#				      to ambiguous specification in RFC4507.
+#
+#			    ALL       Enable various bug workarounds
+#				      suggested as "harmless" by OpenSSL
+#				      Be warned that this reduces SSL/TLS
+#				      strength to some attacks.
+#
+#			See the OpenSSL SSL_CTX_set_options documentation for a
+#			more complete list.
+#
+#	sslcafile=... 	A file containing additional CA certificates to use
+#			when verifying the peer certificate.
+#
+#	sslcapath=...	A directory containing additional CA certificates to
+#			use when verifying the peer certificate.
+#
+#	sslcrlfile=... 	A certificate revocation list file to use when
+#			verifying the peer certificate.
+#
+#	sslflags=...	Specify various flags modifying the SSL implementation:
+#
+#			DONT_VERIFY_PEER
+#				Accept certificates even if they fail to
+#				verify.
+#			NO_DEFAULT_CA
+#				Don't use the default CA list built in
+#				to OpenSSL.
+#			DONT_VERIFY_DOMAIN
+#				Don't verify the peer certificate
+#				matches the server name
+#
+#	ssldomain= 	The peer name as advertised in it's certificate.
+#			Used for verifying the correctness of the received peer
+#			certificate. If not specified the peer hostname will be
+#			used.
+#
+#	front-end-https
+#			Enable the "Front-End-Https: On" header needed when
+#			using Squid as a SSL frontend in front of Microsoft OWA.
+#			See MS KB document Q307347 for details on this header.
+#			If set to auto the header will only be added if the
+#			request is forwarded as a https:// URL.
+#
+#
+#	==== GENERAL OPTIONS ====
+#
+#	connect-timeout=N
+#			A peer-specific connect timeout.
+#			Also see the peer_connect_timeout directive.
+#
+#	connect-fail-limit=N
+#			How many times connecting to a peer must fail before
+#			it is marked as down. Standby connection failures
+#			count towards this limit. Default is 10.
+#
+#	allow-miss	Disable Squid's use of only-if-cached when forwarding
+#			requests to siblings. This is primarily useful when
+#			icp_hit_stale is used by the sibling. Excessive use
+#			of this option may result in forwarding loops. One way
+#			to prevent peering loops when using this option, is to
+#			deny cache peer usage on requests from a peer:
+#			acl fromPeer ...
+#			cache_peer_access peerName deny fromPeer
+#
+#	max-conn=N 	Limit the number of concurrent connections the Squid
+#			may open to this peer, including already opened idle
+#			and standby connections. There is no peer-specific
+#			connection limit by default.
+#
+#			A peer exceeding the limit is not used for new
+#			requests unless a standby connection is available.
+#
+#			max-conn currently works poorly with idle persistent
+#			connections: When a peer reaches its max-conn limit,
+#			and there are idle persistent connections to the peer,
+#			the peer may not be selected because the limiting code
+#			does not know whether Squid can reuse those idle
+#			connections.
+#
+#	standby=N	Maintain a pool of N "hot standby" connections to an
+#			UP peer, available for requests when no idle
+#			persistent connection is available (or safe) to use.
+#			By default and with zero N, no such pool is maintained.
+#			N must not exceed the max-conn limit (if any).
+#
+#			At start or after reconfiguration, Squid opens new TCP
+#			standby connections until there are N connections
+#			available and then replenishes the standby pool as
+#			opened connections are used up for requests. A used
+#			connection never goes back to the standby pool, but
+#			may go to the regular idle persistent connection pool
+#			shared by all peers and origin servers.
+#
+#			Squid never opens multiple new standby connections
+#			concurrently.  This one-at-a-time approach minimizes
+#			flooding-like effect on peers. Furthermore, just a few
+#			standby connections should be sufficient in most cases
+#			to supply most new requests with a ready-to-use
+#			connection.
+#
+#			Standby connections obey server_idle_pconn_timeout.
+#			For the feature to work as intended, the peer must be
+#			configured to accept and keep them open longer than
+#			the idle timeout at the connecting Squid, to minimize
+#			race conditions typical to idle used persistent
+#			connections. Default request_timeout and
+#			server_idle_pconn_timeout values ensure such a
+#			configuration.
+#
+#	name=xxx	Unique name for the peer.
+#			Required if you have multiple peers on the same host
+#			but different ports.
+#			This name can be used in cache_peer_access and similar
+#			directives to identify the peer.
+#			Can be used by outgoing access controls through the
+#			peername ACL type.
+#
+#	no-tproxy	Do not use the client-spoof TPROXY support when forwarding
+#			requests to this peer. Use normal address selection instead.
+#			This overrides the spoof_client_ip ACL.
+#
+#	proxy-only	objects fetched from the peer will not be stored locally.
+#
+#Default:
+# none
+
+#  TAG: cache_peer_domain
+#	Use to limit the domains for which a neighbor cache will be
+#	queried.
+#
+#	Usage:
+#		cache_peer_domain cache-host domain [domain ...]
+#		cache_peer_domain cache-host !domain
+#
+#	For example, specifying
+#
+#		cache_peer_domain parent.foo.net	.edu
+#
+#	has the effect such that UDP query packets are sent to
+#	'bigserver' only when the requested object exists on a
+#	server in the .edu domain.  Prefixing the domainname
+#	with '!' means the cache will be queried for objects
+#	NOT in that domain.
+#
+#	NOTE:	* Any number of domains may be given for a cache-host,
+#		  either on the same or separate lines.
+#		* When multiple domains are given for a particular
+#		  cache-host, the first matched domain is applied.
+#		* Cache hosts with no domain restrictions are queried
+#		  for all requests.
+#		* There are no defaults.
+#		* There is also a 'cache_peer_access' tag in the ACL
+#		  section.
+#Default:
+# none
+
+#  TAG: cache_peer_access
+#	Restricts usage of cache_peer proxies.
+#
+#	Usage:
+#		cache_peer_access peer-name allow|deny [!]aclname ...
+#
+#	For the required peer-name parameter, use either the value of the
+#	cache_peer name=value parameter or, if name=value is missing, the
+#	cache_peer hostname parameter.
+#
+#	This directive narrows down the selection of peering candidates, but
+#	does not determine the order in which the selected candidates are
+#	contacted. That order is determined by the peer selection algorithms
+#	(see PEER SELECTION sections in the cache_peer documentation).
+#
+#	If a deny rule matches, the corresponding peer will not be contacted
+#	for the current transaction -- Squid will not send ICP queries and
+#	will not forward HTTP requests to that peer. An allow match leaves
+#	the corresponding peer in the selection. The first match for a given
+#	peer wins for that peer.
+#
+#	The relative order of cache_peer_access directives for the same peer
+#	matters. The relative order of any two cache_peer_access directives
+#	for different peers does not matter. To ease interpretation, it is a
+#	good idea to group cache_peer_access directives for the same peer
+#	together.
+#
+#	A single cache_peer_access directive may be evaluated multiple times
+#	for a given transaction because individual peer selection algorithms
+#	may check it independently from each other. These redundant checks
+#	may be optimized away in future Squid versions.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# No peer usage restrictions.
+
+#  TAG: neighbor_type_domain
+#	Modify the cache_peer neighbor type when passing requests
+#	about specific domains to the peer.
+#
+#	Usage:
+#		 neighbor_type_domain neighbor parent|sibling domain domain ...
+#
+#	For example:
+#		cache_peer foo.example.com parent 3128 3130
+#		neighbor_type_domain foo.example.com sibling .au .de
+#
+#	The above configuration treats all requests to foo.example.com as a
+#	parent proxy unless the request is for a .au or .de ccTLD domain name.
+#Default:
+# The peer type from cache_peer directive is used for all requests to that peer.
+
+#  TAG: dead_peer_timeout	(seconds)
+#	This controls how long Squid waits to declare a peer cache
+#	as "dead."  If there are no ICP replies received in this
+#	amount of time, Squid will declare the peer dead and not
+#	expect to receive any further ICP replies.  However, it
+#	continues to send ICP queries, and will mark the peer as
+#	alive upon receipt of the first subsequent ICP reply.
+#
+#	This timeout also affects when Squid expects to receive ICP
+#	replies from peers.  If more than 'dead_peer' seconds have
+#	passed since the last ICP reply was received, Squid will not
+#	expect to receive an ICP reply on the next query.  Thus, if
+#	your time between requests is greater than this timeout, you
+#	will see a lot of requests sent DIRECT to origin servers
+#	instead of to your parents.
+#Default:
+# dead_peer_timeout 10 seconds
+
+#  TAG: forward_max_tries
+#	Controls how many different forward paths Squid will try
+#	before giving up. See also forward_timeout.
+#
+#	NOTE: connect_retries (default: none) can make each of these
+#	possible forwarding paths be tried multiple times.
+#Default:
+# forward_max_tries 25
+
+# MEMORY CACHE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_mem	(bytes)
+#	NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE.
+#	IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL
+#	USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER
+#	THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS.
+#
+#	'cache_mem' specifies the ideal amount of memory to be used
+#	for:
+#		* In-Transit objects
+#		* Hot Objects
+#		* Negative-Cached objects
+#
+#	Data for these objects are stored in 4 KB blocks.  This
+#	parameter specifies the ideal upper limit on the total size of
+#	4 KB blocks allocated.  In-Transit objects take the highest
+#	priority.
+#
+#	In-transit objects have priority over the others.  When
+#	additional space is needed for incoming data, negative-cached
+#	and hot objects will be released.  In other words, the
+#	negative-cached and hot objects will fill up any unused space
+#	not needed for in-transit objects.
+#
+#	If circumstances require, this limit will be exceeded.
+#	Specifically, if your incoming request rate requires more than
+#	'cache_mem' of memory to hold in-transit objects, Squid will
+#	exceed this limit to satisfy the new requests.  When the load
+#	decreases, blocks will be freed until the high-water mark is
+#	reached.  Thereafter, blocks will be used to store hot
+#	objects.
+#
+#	If shared memory caching is enabled, Squid does not use the shared
+#	cache space for in-transit objects, but they still consume as much
+#	local memory as they need. For more details about the shared memory
+#	cache, see memory_cache_shared.
+#Default:
+# cache_mem 256 MB
+
+#  TAG: maximum_object_size_in_memory	(bytes)
+#	Objects greater than this size will not be attempted to kept in
+#	the memory cache. This should be set high enough to keep objects
+#	accessed frequently in memory to improve performance whilst low
+#	enough to keep larger objects from hoarding cache_mem.
+#Default:
+# maximum_object_size_in_memory 512 KB
+
+#  TAG: memory_cache_shared	on|off
+#	Controls whether the memory cache is shared among SMP workers.
+#
+#	The shared memory cache is meant to occupy cache_mem bytes and replace
+#	the non-shared memory cache, although some entities may still be
+#	cached locally by workers for now (e.g., internal and in-transit
+#	objects may be served from a local memory cache even if shared memory
+#	caching is enabled).
+#
+#	By default, the memory cache is shared if and only if all of the
+#	following conditions are satisfied: Squid runs in SMP mode with
+#	multiple workers, cache_mem is positive, and Squid environment
+#	supports required IPC primitives (e.g., POSIX shared memory segments
+#	and GCC-style atomic operations).
+#
+#	To avoid blocking locks, shared memory uses opportunistic algorithms
+#	that do not guarantee that every cachable entity that could have been
+#	shared among SMP workers will actually be shared.
+#Default:
+# "on" where supported if doing memory caching with multiple SMP workers.
+
+#  TAG: memory_cache_mode
+#	Controls which objects to keep in the memory cache (cache_mem)
+#
+#	always	Keep most recently fetched objects in memory (default)
+#
+#	disk	Only disk cache hits are kept in memory, which means
+#		an object must first be cached on disk and then hit
+#		a second time before cached in memory.
+#
+#	network	Only objects fetched from network is kept in memory
+#Default:
+# Keep the most recently fetched objects in memory
+
+#  TAG: memory_replacement_policy
+#	The memory replacement policy parameter determines which
+#	objects are purged from memory when memory space is needed.
+#
+#	See cache_replacement_policy for details on algorithms.
+#Default:
+# memory_replacement_policy lru
+
+# DISK CACHE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_replacement_policy
+#	The cache replacement policy parameter determines which
+#	objects are evicted (replaced) when disk space is needed.
+#
+#	    lru       : Squid's original list based LRU policy
+#	    heap GDSF : Greedy-Dual Size Frequency
+#	    heap LFUDA: Least Frequently Used with Dynamic Aging
+#	    heap LRU  : LRU policy implemented using a heap
+#
+#	Applies to any cache_dir lines listed below this directive.
+#
+#	The LRU policies keeps recently referenced objects.
+#
+#	The heap GDSF policy optimizes object hit rate by keeping smaller
+#	popular objects in cache so it has a better chance of getting a
+#	hit.  It achieves a lower byte hit rate than LFUDA though since
+#	it evicts larger (possibly popular) objects.
+#
+#	The heap LFUDA policy keeps popular objects in cache regardless of
+#	their size and thus optimizes byte hit rate at the expense of
+#	hit rate since one large, popular object will prevent many
+#	smaller, slightly less popular objects from being cached.
+#
+#	Both policies utilize a dynamic aging mechanism that prevents
+#	cache pollution that can otherwise occur with frequency-based
+#	replacement policies.
+#
+#	NOTE: if using the LFUDA replacement policy you should increase
+#	the value of maximum_object_size above its default of 4 MB to
+#	to maximize the potential byte hit rate improvement of LFUDA.
+#
+#	For more information about the GDSF and LFUDA cache replacement
+#	policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html
+#	and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html.
+#Default:
+# cache_replacement_policy lru
+
+#  TAG: minimum_object_size	(bytes)
+#	Objects smaller than this size will NOT be saved on disk.  The
+#	value is specified in bytes, and the default is 0 KB, which
+#	means all responses can be stored.
+#Default:
+# no limit
+
+#  TAG: maximum_object_size	(bytes)
+#	Set the default value for max-size parameter on any cache_dir.
+#	The value is specified in bytes, and the default is 4 MB.
+#
+#	If you wish to get a high BYTES hit ratio, you should probably
+#	increase this (one 32 MB object hit counts for 3200 10KB
+#	hits).
+#
+#	If you wish to increase hit ratio more than you want to
+#	save bandwidth you should leave this low.
+#
+#	NOTE: if using the LFUDA replacement policy you should increase
+#	this value to maximize the byte hit rate improvement of LFUDA!
+#	See cache_replacement_policy for a discussion of this policy.
+#Default:
+# maximum_object_size 4 MB
+
+#  TAG: cache_dir
+#	Format:
+#		cache_dir Type Directory-Name Fs-specific-data [options]
+#
+#	You can specify multiple cache_dir lines to spread the
+#	cache among different disk partitions.
+#
+#	Type specifies the kind of storage system to use. Only "ufs"
+#	is built by default. To enable any of the other storage systems
+#	see the --enable-storeio configure option.
+#
+#	'Directory' is a top-level directory where cache swap
+#	files will be stored.  If you want to use an entire disk
+#	for caching, this can be the mount-point directory.
+#	The directory must exist and be writable by the Squid
+#	process.  Squid will NOT create this directory for you.
+#
+#	In SMP configurations, cache_dir must not precede the workers option
+#	and should use configuration macros or conditionals to give each
+#	worker interested in disk caching a dedicated cache directory.
+#
+#
+#	====  The ufs store type  ====
+#
+#	"ufs" is the old well-known Squid storage format that has always
+#	been there.
+#
+#	Usage:
+#		cache_dir ufs Directory-Name Mbytes L1 L2 [options]
+#
+#	'Mbytes' is the amount of disk space (MB) to use under this
+#	directory.  The default is 100 MB.  Change this to suit your
+#	configuration.  Do NOT put the size of your disk drive here.
+#	Instead, if you want Squid to use the entire disk drive,
+#	subtract 20% and use that value.
+#
+#	'L1' is the number of first-level subdirectories which
+#	will be created under the 'Directory'.  The default is 16.
+#
+#	'L2' is the number of second-level subdirectories which
+#	will be created under each first-level directory.  The default
+#	is 256.
+#
+#
+#	====  The aufs store type  ====
+#
+#	"aufs" uses the same storage format as "ufs", utilizing
+#	POSIX-threads to avoid blocking the main Squid process on
+#	disk-I/O. This was formerly known in Squid as async-io.
+#
+#	Usage:
+#		cache_dir aufs Directory-Name Mbytes L1 L2 [options]
+#
+#	see argument descriptions under ufs above
+#
+#
+#	====  The diskd store type  ====
+#
+#	"diskd" uses the same storage format as "ufs", utilizing a
+#	separate process to avoid blocking the main Squid process on
+#	disk-I/O.
+#
+#	Usage:
+#		cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n]
+#
+#	see argument descriptions under ufs above
+#
+#	Q1 specifies the number of unacknowledged I/O requests when Squid
+#	stops opening new files. If this many messages are in the queues,
+#	Squid won't open new files. Default is 64
+#
+#	Q2 specifies the number of unacknowledged messages when Squid
+#	starts blocking.  If this many messages are in the queues,
+#	Squid blocks until it receives some replies. Default is 72
+#
+#	When Q1 < Q2 (the default), the cache directory is optimized
+#	for lower response time at the expense of a decrease in hit
+#	ratio.  If Q1 > Q2, the cache directory is optimized for
+#	higher hit ratio at the expense of an increase in response
+#	time.
+#
+#
+#	====  The rock store type  ====
+#
+#	Usage:
+#	    cache_dir rock Directory-Name Mbytes [options]
+#
+#	The Rock Store type is a database-style storage. All cached
+#	entries are stored in a "database" file, using fixed-size slots.
+#	A single entry occupies one or more slots.
+#
+#	If possible, Squid using Rock Store creates a dedicated kid
+#	process called "disker" to avoid blocking Squid worker(s) on disk
+#	I/O. One disker kid is created for each rock cache_dir.  Diskers
+#	are created only when Squid, running in daemon mode, has support
+#	for the IpcIo disk I/O module.
+#
+#	swap-timeout=msec: Squid will not start writing a miss to or
+#	reading a hit from disk if it estimates that the swap operation
+#	will take more than the specified number of milliseconds. By
+#	default and when set to zero, disables the disk I/O time limit
+#	enforcement. Ignored when using blocking I/O module because
+#	blocking synchronous I/O does not allow Squid to estimate the
+#	expected swap wait time.
+#
+#	max-swap-rate=swaps/sec: Artificially limits disk access using
+#	the specified I/O rate limit. Swap out requests that
+#	would cause the average I/O rate to exceed the limit are
+#	delayed. Individual swap in requests (i.e., hits or reads) are
+#	not delayed, but they do contribute to measured swap rate and
+#	since they are placed in the same FIFO queue as swap out
+#	requests, they may wait longer if max-swap-rate is smaller.
+#	This is necessary on file systems that buffer "too
+#	many" writes and then start blocking Squid and other processes
+#	while committing those writes to disk.  Usually used together
+#	with swap-timeout to avoid excessive delays and queue overflows
+#	when disk demand exceeds available disk "bandwidth". By default
+#	and when set to zero, disables the disk I/O rate limit
+#	enforcement. Currently supported by IpcIo module only.
+#
+#	slot-size=bytes: The size of a database "record" used for
+#	storing cached responses. A cached response occupies at least
+#	one slot and all database I/O is done using individual slots so
+#	increasing this parameter leads to more disk space waste while
+#	decreasing it leads to more disk I/O overheads. Should be a
+#	multiple of your operating system I/O page size. Defaults to
+#	16KBytes. A housekeeping header is stored with each slot and
+#	smaller slot-sizes will be rejected. The header is smaller than
+#	100 bytes.
+#
+#
+#	==== COMMON OPTIONS ====
+#
+#	no-store	no new objects should be stored to this cache_dir.
+#
+#	min-size=n	the minimum object size in bytes this cache_dir
+#			will accept.  It's used to restrict a cache_dir
+#			to only store large objects (e.g. AUFS) while
+#			other stores are optimized for smaller objects
+#			(e.g. Rock).
+#			Defaults to 0.
+#
+#	max-size=n	the maximum object size in bytes this cache_dir
+#			supports.
+#			The value in maximum_object_size directive sets
+#			the default unless more specific details are
+#			available (ie a small store capacity).
+#
+#	Note: To make optimal use of the max-size limits you should order
+#	the cache_dir lines with the smallest max-size value first.
+#
+#Default:
+# No disk cache. Store cache ojects only in memory.
+#
+
+# Uncomment and adjust the following to add a disk cache directory.
+#cache_dir ufs /var/spool/squid 100 16 256
+
+#  TAG: store_dir_select_algorithm
+#	How Squid selects which cache_dir to use when the response
+#	object will fit into more than one.
+#
+#	Regardless of which algorithm is used the cache_dir min-size
+#	and max-size parameters are obeyed. As such they can affect
+#	the selection algorithm by limiting the set of considered
+#	cache_dir.
+#
+#	Algorithms:
+#
+#		least-load
+#
+#	This algorithm is suited to caches with similar cache_dir
+#	sizes and disk speeds.
+#
+#	The disk with the least I/O pending is selected.
+#	When there are multiple disks with the same I/O load ranking
+#	the cache_dir with most available capacity is selected.
+#
+#	When a mix of cache_dir sizes are configured the faster disks
+#	have a naturally lower I/O loading and larger disks have more
+#	capacity. So space used to store objects and data throughput
+#	may be very unbalanced towards larger disks.
+#
+#
+#		round-robin
+#
+#	This algorithm is suited to caches with unequal cache_dir
+#	disk sizes.
+#
+#	Each cache_dir is selected in a rotation. The next suitable
+#	cache_dir is used.
+#
+#	Available cache_dir capacity is only considered in relation
+#	to whether the object will fit and meets the min-size and
+#	max-size parameters.
+#
+#	Disk I/O loading is only considered to prevent overload on slow
+#	disks. This algorithm does not spread objects by size, so any
+#	I/O loading per-disk may appear very unbalanced and volatile.
+#
+#	If several cache_dirs use similar min-size, max-size, or other
+#	limits to to reject certain responses, then do not group such
+#	cache_dir lines together, to avoid round-robin selection bias
+#	towards the first cache_dir after the group. Instead, interleave
+#	cache_dir lines from different groups. For example:
+#
+#		store_dir_select_algorithm round-robin
+#		cache_dir rock /hdd1 ... min-size=100000
+#		cache_dir rock /ssd1 ... max-size=99999
+#		cache_dir rock /hdd2 ... min-size=100000
+#		cache_dir rock /ssd2 ... max-size=99999
+#		cache_dir rock /hdd3 ... min-size=100000
+#		cache_dir rock /ssd3 ... max-size=99999
+#Default:
+# store_dir_select_algorithm least-load
+
+#  TAG: max_open_disk_fds
+#	To avoid having disk as the I/O bottleneck Squid can optionally
+#	bypass the on-disk cache if more than this amount of disk file
+#	descriptors are open.
+#
+#	A value of 0 indicates no limit.
+#Default:
+# no limit
+
+#  TAG: cache_swap_low	(percent, 0-100)
+#	The low-water mark for AUFS/UFS/diskd cache object eviction by
+#	the cache_replacement_policy algorithm.
+#
+#	Removal begins when the swap (disk) usage of a cache_dir is
+#	above this low-water mark and attempts to maintain utilization
+#	near the low-water mark.
+#
+#	As swap utilization increases towards the high-water mark set
+#	by cache_swap_high object eviction becomes more agressive.
+#
+#	The value difference in percentages between low- and high-water
+#	marks represent an eviction rate of 300 objects per second and
+#	the rate continues to scale in agressiveness by multiples of
+#	this above the high-water mark.
+#
+#	Defaults are 90% and 95%. If you have a large cache, 5% could be
+#	hundreds of MB. If this is the case you may wish to set these
+#	numbers closer together.
+#
+#	See also cache_swap_high and cache_replacement_policy
+#Default:
+# cache_swap_low 90
+
+#  TAG: cache_swap_high	(percent, 0-100)
+#	The high-water mark for AUFS/UFS/diskd cache object eviction by
+#	the cache_replacement_policy algorithm.
+#
+#	Removal begins when the swap (disk) usage of a cache_dir is
+#	above the low-water mark set by cache_swap_low and attempts to
+#	maintain utilization near the low-water mark.
+#
+#	As swap utilization increases towards this high-water mark object
+#	eviction becomes more agressive.
+#
+#	The value difference in percentages between low- and high-water
+#	marks represent an eviction rate of 300 objects per second and
+#	the rate continues to scale in agressiveness by multiples of
+#	this above the high-water mark.
+#
+#	Defaults are 90% and 95%. If you have a large cache, 5% could be
+#	hundreds of MB. If this is the case you may wish to set these
+#	numbers closer together.
+#
+#	See also cache_swap_low and cache_replacement_policy
+#Default:
+# cache_swap_high 95
+
+# LOGFILE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: logformat
+#	Usage:
+#
+#	logformat <name> <format specification>
+#
+#	Defines an access log format.
+#
+#	The <format specification> is a string with embedded % format codes
+#
+#	% format codes all follow the same basic structure where all but
+#	the formatcode is optional. Output strings are automatically escaped
+#	as required according to their context and the output format
+#	modifiers are usually not needed, but can be specified if an explicit
+#	output format is desired.
+#
+#		% ["|[|'|#] [-] [[0]width] [{argument}] formatcode
+#
+#		"	output in quoted string format
+#		[	output in squid text log format as used by log_mime_hdrs
+#		#	output in URL quoted format
+#		'	output as-is
+#
+#		-	left aligned
+#
+#		width	minimum and/or maximum field width:
+#			    [width_min][.width_max]
+#			When minimum starts with 0, the field is zero-padded.
+#			String values exceeding maximum width are truncated.
+#
+#		{arg}	argument such as header name etc
+#
+#	Format codes:
+#
+#		%	a literal % character
+#		sn	Unique sequence number per log line entry
+#		err_code    The ID of an error response served by Squid or
+#				a similar internal error identifier.
+#		err_detail  Additional err_code-dependent error information.
+#		note	The annotation specified by the argument. Also
+#			logs the adaptation meta headers set by the
+#			adaptation_meta configuration parameter.
+#			If no argument given all annotations logged.
+#			The argument may include a separator to use with
+#			annotation values:
+#                            name[:separator]
+#			By default, multiple note values are separated with ","
+#			and multiple notes are separated with "\r\n".
+#			When logging named notes with %{name}note, the
+#			explicitly configured separator is used between note
+#			values. When logging all notes with %note, the
+#			explicitly configured separator is used between
+#			individual notes. There is currently no way to
+#			specify both value and notes separators when logging
+#			all notes with %note.
+#
+#	Connection related format codes:
+#
+#		>a	Client source IP address
+#		>A	Client FQDN
+#		>p	Client source port
+#		>eui	Client source EUI (MAC address, EUI-48 or EUI-64 identifier)
+#		>la	Local IP address the client connected to
+#		>lp	Local port number the client connected to
+#		>qos    Client connection TOS/DSCP value set by Squid
+#		>nfmark Client connection netfilter mark set by Squid
+#
+#		la	Local listening IP address the client connection was connected to.
+#		lp	Local listening port number the client connection was connected to.
+#
+#		<a	Server IP address of the last server or peer connection
+#		<A	Server FQDN or peer name
+#		<p	Server port number of the last server or peer connection
+#		<la	Local IP address of the last server or peer connection
+#		<lp     Local port number of the last server or peer connection
+#		<qos	Server connection TOS/DSCP value set by Squid
+#		<nfmark Server connection netfilter mark set by Squid
+#
+#	Time related format codes:
+#
+#		ts	Seconds since epoch
+#		tu	subsecond time (milliseconds)
+#		tl	Local time. Optional strftime format argument
+#				default %d/%b/%Y:%H:%M:%S %z
+#		tg	GMT time. Optional strftime format argument
+#				default %d/%b/%Y:%H:%M:%S %z
+#		tr	Response time (milliseconds)
+#		dt	Total time spent making DNS lookups (milliseconds)
+#		tS	Approximate master transaction start time in
+#			<full seconds since epoch>.<fractional seconds> format.
+#			Currently, Squid considers the master transaction
+#			started when a complete HTTP request header initiating
+#			the transaction is received from the client. This is
+#			the same value that Squid uses to calculate transaction
+#			response time when logging %tr to access.log. Currently,
+#			Squid uses millisecond resolution for %tS values,
+#			similar to the default access.log "current time" field
+#			(%ts.%03tu).
+#
+#	Access Control related format codes:
+#
+#		et	Tag returned by external acl
+#		ea	Log string returned by external acl
+#		un	User name (any available)
+#		ul	User name from authentication
+#		ue	User name from external acl helper
+#		ui	User name from ident
+#		un	A user name. Expands to the first available name
+#			from the following list of information sources:
+#			- authenticated user name, like %ul
+#			- user name supplied by an external ACL, like %ue
+#			- SSL client name, like %us
+#			- ident user name, like %ui
+#		credentials Client credentials. The exact meaning depends on
+#			the authentication scheme: For Basic authentication,
+#			it is the password; for Digest, the realm sent by the
+#			client; for NTLM and Negotiate, the client challenge
+#			or client credentials prefixed with "YR " or "KK ".
+#
+#	HTTP related format codes:
+#
+#	    REQUEST
+#
+#		[http::]rm	Request method (GET/POST etc)
+#		[http::]>rm	Request method from client
+#		[http::]<rm	Request method sent to server or peer
+#		[http::]ru	Request URL from client (historic, filtered for logging)
+#		[http::]>ru	Request URL from client
+#		[http::]<ru	Request URL sent to server or peer
+#		[http::]>rs	Request URL scheme from client
+#		[http::]<rs	Request URL scheme sent to server or peer
+#		[http::]>rd	Request URL domain from client
+#		[http::]<rd	Request URL domain sent to server or peer
+#		[http::]>rP	Request URL port from client
+#		[http::]<rP	Request URL port sent to server or peer
+#		[http::]rp	Request URL path excluding hostname
+#		[http::]>rp	Request URL path excluding hostname from client
+#		[http::]<rp	Request URL path excluding hostname sent to server or peer
+#		[http::]rv	Request protocol version
+#		[http::]>rv	Request protocol version from client
+#		[http::]<rv	Request protocol version sent to server or peer
+#
+#		[http::]>h	Original received request header.
+#				Usually differs from the request header sent by
+#				Squid, although most fields are often preserved.
+#				Accepts optional header field name/value filter
+#				argument using name[:[separator]element] format.
+#		[http::]>ha	Received request header after adaptation and
+#				redirection (pre-cache REQMOD vectoring point).
+#				Usually differs from the request header sent by
+#				Squid, although most fields are often preserved.
+#				Optional header name argument as for >h
+#
+#
+#	    RESPONSE
+#
+#		[http::]<Hs	HTTP status code received from the next hop
+#		[http::]>Hs	HTTP status code sent to the client
+#
+#		[http::]<h	Reply header. Optional header name argument
+#				as for >h
+#
+#		[http::]mt	MIME content type
+#
+#
+#	    SIZE COUNTERS
+#
+#		[http::]st	Total size of request + reply traffic with client
+#		[http::]>st	Total size of request received from client.
+#				Excluding chunked encoding bytes.
+#		[http::]<st	Total size of reply sent to client (after adaptation)
+#
+#		[http::]>sh	Size of request headers received from client
+#		[http::]<sh	Size of reply headers sent to client (after adaptation)
+#
+#		[http::]<sH	Reply high offset sent
+#		[http::]<sS	Upstream object size
+#
+#		[http::]<bs	Number of HTTP-equivalent message body bytes
+#				received from the next hop, excluding chunked
+#				transfer encoding and control messages.
+#				Generated FTP/Gopher listings are treated as
+#				received bodies.
+#
+#
+#	    TIMING
+#
+#		[http::]<pt	Peer response time in milliseconds. The timer starts
+#				when the last request byte is sent to the next hop
+#				and stops when the last response byte is received.
+#		[http::]<tt	Total time in milliseconds. The timer
+#				starts with the first connect request (or write I/O)
+#				sent to the first selected peer. The timer stops
+#				with the last I/O with the last peer.
+#
+#	Squid handling related format codes:
+#
+#		Ss	Squid request status (TCP_MISS etc)
+#		Sh	Squid hierarchy status (DEFAULT_PARENT etc)
+#
+#	SSL-related format codes:
+#
+#		ssl::bump_mode	SslBump decision for the transaction:
+#
+#				For CONNECT requests that initiated bumping of
+#				a connection and for any request received on
+#				an already bumped connection, Squid logs the
+#				corresponding SslBump mode ("server-first" or
+#				"client-first"). See the ssl_bump option for
+#				more information about these modes.
+#
+#				A "none" token is logged for requests that
+#				triggered "ssl_bump" ACL evaluation matching
+#				either a "none" rule or no rules at all.
+#
+#				In all other cases, a single dash ("-") is
+#				logged.
+#
+#		ssl::>sni	SSL client SNI sent to Squid. Available only
+#				after the peek, stare, or splice SSL bumping
+#				actions.
+#
+#	If ICAP is enabled, the following code becomes available (as
+#	well as ICAP log codes documented with the icap_log option):
+#
+#		icap::tt        Total ICAP processing time for the HTTP
+#				transaction. The timer ticks when ICAP
+#				ACLs are checked and when ICAP
+#				transaction is in progress.
+#
+#	If adaptation is enabled the following three codes become available:
+#
+#		adapt::<last_h	The header of the last ICAP response or
+#				meta-information from the last eCAP
+#				transaction related to the HTTP transaction.
+#				Like <h, accepts an optional header name
+#				argument.
+#
+#		adapt::sum_trs Summed adaptation transaction response
+#				times recorded as a comma-separated list in
+#				the order of transaction start time. Each time
+#				value is recorded as an integer number,
+#				representing response time of one or more
+#				adaptation (ICAP or eCAP) transaction in
+#				milliseconds.  When a failed transaction is
+#				being retried or repeated, its time is not
+#				logged individually but added to the
+#				replacement (next) transaction. See also:
+#				adapt::all_trs.
+#
+#		adapt::all_trs All adaptation transaction response times.
+#				Same as adaptation_strs but response times of
+#				individual transactions are never added
+#				together. Instead, all transaction response
+#				times are recorded individually.
+#
+#	You can prefix adapt::*_trs format codes with adaptation
+#	service name in curly braces to record response time(s) specific
+#	to that service. For example: %{my_service}adapt::sum_trs
+#
+#	If SSL is enabled, the following formating codes become available:
+#
+#		%ssl::>cert_subject The Subject field of the received client
+#				SSL certificate or a dash ('-') if Squid has
+#				received an invalid/malformed certificate or
+#				no certificate at all. Consider encoding the
+#				logged value because Subject often has spaces.
+#
+#		%ssl::>cert_issuer The Issuer field of the received client
+#				SSL certificate or a dash ('-') if Squid has
+#				received an invalid/malformed certificate or
+#				no certificate at all. Consider encoding the
+#				logged value because Issuer often has spaces.
+#
+#	The default formats available (which do not need re-defining) are:
+#
+#logformat squid      %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
+#logformat common     %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh
+#logformat combined   %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
+#logformat referrer   %ts.%03tu %>a %{Referer}>h %ru
+#logformat useragent  %>a [%tl] "%{User-Agent}>h"
+#
+#	NOTE: When the log_mime_hdrs directive is set to ON.
+#		The squid, common and combined formats have a safely encoded copy
+#		of the mime headers appended to each line within a pair of brackets.
+#
+#	NOTE: The common and combined formats are not quite true to the Apache definition.
+#		The logs from Squid contain an extra status and hierarchy code appended.
+#
+#Default:
+# The format definitions squid, common, combined, referrer, useragent are built in.
+
+#  TAG: access_log
+#	Configures whether and how Squid logs HTTP and ICP transactions.
+#	If access logging is enabled, a single line is logged for every
+#	matching HTTP or ICP request. The recommended directive formats are:
+#
+#	access_log <module>:<place> [option ...] [acl acl ...]
+#	access_log none [acl acl ...]
+#
+#	The following directive format is accepted but may be deprecated:
+#	access_log <module>:<place> [<logformat name> [acl acl ...]]
+#
+#        In most cases, the first ACL name must not contain the '=' character
+#	and should not be equal to an existing logformat name. You can always
+#	start with an 'all' ACL to work around those restrictions.
+#
+#	Will log to the specified module:place using the specified format (which
+#	must be defined in a logformat directive) those entries which match
+#	ALL the acl's specified (which must be defined in acl clauses).
+#	If no acl is specified, all requests will be logged to this destination.
+#
+#	===== Available options for the recommended directive format =====
+#
+#	logformat=name		Names log line format (either built-in or
+#				defined by a logformat directive). Defaults
+#				to 'squid'.
+#
+#	buffer-size=64KB	Defines approximate buffering limit for log
+#				records (see buffered_logs).  Squid should not
+#				keep more than the specified size and, hence,
+#				should flush records before the buffer becomes
+#				full to avoid overflows under normal
+#				conditions (the exact flushing algorithm is
+#				module-dependent though).  The on-error option
+#				controls overflow handling.
+#
+#	on-error=die|drop	Defines action on unrecoverable errors. The
+#				'drop' action ignores (i.e., does not log)
+#				affected log records. The default 'die' action
+#				kills the affected worker. The drop action
+#				support has not been tested for modules other
+#				than tcp.
+#
+#	===== Modules Currently available =====
+#
+#	none	Do not log any requests matching these ACL.
+#		Do not specify Place or logformat name.
+#
+#	stdio	Write each log line to disk immediately at the completion of
+#		each request.
+#		Place: the filename and path to be written.
+#
+#	daemon	Very similar to stdio. But instead of writing to disk the log
+#		line is passed to a daemon helper for asychronous handling instead.
+#		Place: varies depending on the daemon.
+#
+#		log_file_daemon Place: the file name and path to be written.
+#
+#	syslog	To log each request via syslog facility.
+#		Place: The syslog facility and priority level for these entries.
+#		Place Format:  facility.priority
+#
+#		where facility could be any of:
+#			authpriv, daemon, local0 ... local7 or user.
+#
+#		And priority could be any of:
+#			err, warning, notice, info, debug.
+#
+#	udp	To send each log line as text data to a UDP receiver.
+#		Place: The destination host name or IP and port.
+#		Place Format:   //host:port
+#
+#	tcp	To send each log line as text data to a TCP receiver.
+#		Lines may be accumulated before sending (see buffered_logs).
+#		Place: The destination host name or IP and port.
+#		Place Format:   //host:port
+#
+#	Default:
+#		access_log daemon:/var/log/squid/access.log squid
+#Default:
+# access_log daemon:/var/log/squid/access.log squid
+
+#  TAG: icap_log
+#	ICAP log files record ICAP transaction summaries, one line per
+#	transaction.
+#
+#	The icap_log option format is:
+#	icap_log <filepath> [<logformat name> [acl acl ...]]
+#	icap_log none [acl acl ...]]
+#
+#	Please see access_log option documentation for details. The two
+#	kinds of logs share the overall configuration approach and many
+#	features.
+#
+#	ICAP processing of a single HTTP message or transaction may
+#	require multiple ICAP transactions.  In such cases, multiple
+#	ICAP transaction log lines will correspond to a single access
+#	log line.
+#
+#	ICAP log supports many access.log logformat %codes. In ICAP context,
+#	HTTP message-related %codes are applied to the HTTP message embedded
+#	in an ICAP message. Logformat "%http::>..." codes are used for HTTP
+#	messages embedded in ICAP requests while "%http::<..." codes are used
+#	for HTTP messages embedded in ICAP responses. For example:
+#
+#		http::>h	To-be-adapted HTTP message headers sent by Squid to
+#				the ICAP service. For REQMOD transactions, these are
+#				HTTP request headers. For RESPMOD, these are HTTP
+#				response headers, but Squid currently cannot log them
+#				(i.e., %http::>h will expand to "-" for RESPMOD).
+#
+#		http::<h	Adapted HTTP message headers sent by the ICAP
+#				service to Squid (i.e., HTTP request headers in regular
+#				REQMOD; HTTP response headers in RESPMOD and during
+#				request satisfaction in REQMOD).
+#
+#	ICAP OPTIONS transactions do not embed HTTP messages.
+#
+#	Several logformat codes below deal with ICAP message bodies. An ICAP
+#	message body, if any, typically includes a complete HTTP message
+#	(required HTTP headers plus optional HTTP message body). When
+#	computing HTTP message body size for these logformat codes, Squid
+#	either includes or excludes chunked encoding overheads; see
+#	code-specific documentation for details.
+#
+#	For Secure ICAP services, all size-related information is currently
+#	computed before/after TLS encryption/decryption, as if TLS was not
+#	in use at all.
+#
+#	The following format codes are also available for ICAP logs:
+#
+#		icap::<A	ICAP server IP address. Similar to <A.
+#
+#		icap::<service_name	ICAP service name from the icap_service
+#				option in Squid configuration file.
+#
+#		icap::ru	ICAP Request-URI. Similar to ru.
+#
+#		icap::rm	ICAP request method (REQMOD, RESPMOD, or
+#				OPTIONS). Similar to existing rm.
+#
+#		icap::>st	The total size of the ICAP request sent to the ICAP
+#				server (ICAP headers + ICAP body), including chunking
+#				metadata (if any).
+#
+#		icap::<st	The total size of the ICAP response received from the
+#				ICAP server (ICAP headers + ICAP body), including
+#				chunking metadata (if any).
+#
+#		icap::<bs	The size of the ICAP response body received from the
+#				ICAP server, excluding chunking metadata (if any).
+#
+#		icap::tr 	Transaction response time (in
+#				milliseconds).  The timer starts when
+#				the ICAP transaction is created and
+#				stops when the transaction is completed.
+#				Similar to tr.
+#
+#		icap::tio	Transaction I/O time (in milliseconds). The
+#				timer starts when the first ICAP request
+#				byte is scheduled for sending. The timers
+#				stops when the last byte of the ICAP response
+#				is received.
+#
+#		icap::to 	Transaction outcome: ICAP_ERR* for all
+#				transaction errors, ICAP_OPT for OPTION
+#				transactions, ICAP_ECHO for 204
+#				responses, ICAP_MOD for message
+#				modification, and ICAP_SAT for request
+#				satisfaction. Similar to Ss.
+#
+#		icap::Hs	ICAP response status code. Similar to Hs.
+#
+#		icap::>h	ICAP request header(s). Similar to >h.
+#
+#		icap::<h	ICAP response header(s). Similar to <h.
+#
+#	The default ICAP log format, which can be used without an explicit
+#	definition, is called icap_squid:
+#
+#logformat icap_squid %ts.%03tu %6icap::tr %>A %icap::to/%03icap::Hs %icap::<st %icap::rm %icap::ru %un -/%icap::<A -
+#
+#	See also: logformat and %adapt::<last_h
+#Default:
+# none
+
+#  TAG: logfile_daemon
+#	Specify the path to the logfile-writing daemon. This daemon is
+#	used to write the access and store logs, if configured.
+#
+#	Squid sends a number of commands to the log daemon:
+#	  L<data>\n - logfile data
+#	  R\n - rotate file
+#	  T\n - truncate file
+#	  O\n - reopen file
+#	  F\n - flush file
+#	  r<n>\n - set rotate count to <n>
+#	  b<n>\n - 1 = buffer output, 0 = don't buffer output
+#
+#	No responses is expected.
+#Default:
+# logfile_daemon /usr/lib/squid/log_file_daemon
+
+#  TAG: stats_collection	allow|deny acl acl...
+#	This options allows you to control which requests gets accounted
+#	in performance counters.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow logging for all transactions.
+
+#  TAG: cache_store_log
+#	Logs the activities of the storage manager.  Shows which
+#	objects are ejected from the cache, and which objects are
+#	saved and for how long.
+#	There are not really utilities to analyze this data, so you can safely
+#	disable it (the default).
+#
+#	Store log uses modular logging outputs. See access_log for the list
+#	of modules supported.
+#
+#	Example:
+#		cache_store_log stdio:/var/log/squid/store.log
+#		cache_store_log daemon:/var/log/squid/store.log
+#Default:
+# none
+
+#  TAG: cache_swap_state
+#	Location for the cache "swap.state" file. This index file holds
+#	the metadata of objects saved on disk.  It is used to rebuild
+#	the cache during startup.  Normally this file resides in each
+#	'cache_dir' directory, but you may specify an alternate
+#	pathname here.  Note you must give a full filename, not just
+#	a directory. Since this is the index for the whole object
+#	list you CANNOT periodically rotate it!
+#
+#	If %s can be used in the file name it will be replaced with a
+#	a representation of the cache_dir name where each / is replaced
+#	with '.'. This is needed to allow adding/removing cache_dir
+#	lines when cache_swap_log is being used.
+#
+#	If have more than one 'cache_dir', and %s is not used in the name
+#	these swap logs will have names such as:
+#
+#		cache_swap_log.00
+#		cache_swap_log.01
+#		cache_swap_log.02
+#
+#	The numbered extension (which is added automatically)
+#	corresponds to the order of the 'cache_dir' lines in this
+#	configuration file.  If you change the order of the 'cache_dir'
+#	lines in this file, these index files will NOT correspond to
+#	the correct 'cache_dir' entry (unless you manually rename
+#	them).  We recommend you do NOT use this option.  It is
+#	better to keep these index files in each 'cache_dir' directory.
+#Default:
+# Store the journal inside its cache_dir
+
+#  TAG: logfile_rotate
+#	Specifies the number of logfile rotations to make when you
+#	type 'squid -k rotate'. The default is 10, which will rotate
+#	with extensions 0 through 9. Setting logfile_rotate to 0 will
+#	disable the file name rotation, but the logfiles are still closed
+#	and re-opened. This will enable you to rename the logfiles
+#	yourself just before sending the rotate signal.
+#
+#	Note, the 'squid -k rotate' command normally sends a USR1
+#	signal to the running squid process.  In certain situations
+#	(e.g. on Linux with Async I/O), USR1 is used for other
+#	purposes, so -k rotate uses another signal.  It is best to get
+#	in the habit of using 'squid -k rotate' instead of 'kill -USR1
+#	<pid>'.
+#
+#	Note, from Squid-3.1 this option is only a default for cache.log,
+#	that log can be rotated separately by using debug_options.
+#
+#	Note2, for Debian/Linux the default of logfile_rotate is
+#	zero, since it includes external logfile-rotation methods.
+#Default:
+# logfile_rotate 0
+
+#  TAG: mime_table
+#	Path to Squid's icon configuration file.
+#
+#	You shouldn't need to change this, but the default file contains
+#	examples and formatting information if you do.
+#Default:
+# mime_table /usr/share/squid/mime.conf
+
+#  TAG: log_mime_hdrs	on|off
+#	The Cache can record both the request and the response MIME
+#	headers for each HTTP transaction.  The headers are encoded
+#	safely and will appear as two bracketed fields at the end of
+#	the access log (for either the native or httpd-emulated log
+#	formats).  To enable this logging set log_mime_hdrs to 'on'.
+#Default:
+# log_mime_hdrs off
+
+#  TAG: pid_filename
+#	A filename to write the process-id to.  To disable, enter "none".
+#Default:
+# pid_filename /var/run/squid.pid
+
+#  TAG: client_netmask
+#	A netmask for client addresses in logfiles and cachemgr output.
+#	Change this to protect the privacy of your cache clients.
+#	A netmask of 255.255.255.0 will log all IP's in that range with
+#	the last digit set to '0'.
+#Default:
+# Log full client IP address
+
+#  TAG: strip_query_terms
+#	By default, Squid strips query terms from requested URLs before
+#	logging.  This protects your user's privacy and reduces log size.
+#
+#	When investigating HIT/MISS or other caching behaviour you
+#	will need to disable this to see the full URL used by Squid.
+#Default:
+# strip_query_terms on
+
+#  TAG: buffered_logs	on|off
+#	Whether to write/send access_log records ASAP or accumulate them and
+#	then write/send them in larger chunks. Buffering may improve
+#	performance because it decreases the number of I/Os. However,
+#	buffering increases the delay before log records become available to
+#	the final recipient (e.g., a disk file or logging daemon) and,
+#	hence, increases the risk of log records loss.
+#
+#	Note that even when buffered_logs are off, Squid may have to buffer
+#	records if it cannot write/send them immediately due to pending I/Os
+#	(e.g., the I/O writing the previous log record) or connectivity loss.
+#
+#	Currently honored by 'daemon' and 'tcp' access_log modules only.
+#Default:
+# buffered_logs off
+
+#  TAG: netdb_filename
+#	Where Squid stores it's netdb journal.
+#	When enabled this journal preserves netdb state between restarts.
+#
+#	To disable, enter "none".
+#Default:
+# netdb_filename stdio:/var/log/squid/netdb.state
+
+# OPTIONS FOR TROUBLESHOOTING
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_log
+#	Squid administrative logging file.
+#
+#	This is where general information about Squid behavior goes. You can
+#	increase the amount of data logged to this file and how often it is
+#	rotated with "debug_options"
+#Default:
+# cache_log /var/log/squid/cache.log
+
+#  TAG: debug_options
+#	Logging options are set as section,level where each source file
+#	is assigned a unique section.  Lower levels result in less
+#	output,  Full debugging (level 9) can result in a very large
+#	log file, so be careful.
+#
+#	The magic word "ALL" sets debugging levels for all sections.
+#	The default is to run with "ALL,1" to record important warnings.
+#
+#	The rotate=N option can be used to keep more or less of these logs
+#	than would otherwise be kept by logfile_rotate.
+#	For most uses a single log should be enough to monitor current
+#	events affecting Squid.
+#Default:
+# Log all critical and important messages.
+
+#  TAG: coredump_dir
+#	By default Squid leaves core files in the directory from where
+#	it was started. If you set 'coredump_dir' to a directory
+#	that exists, Squid will chdir() to that directory at startup
+#	and coredump files will be left there.
+#
+#Default:
+# Use the directory from where Squid was started.
+#
+
+# Leave coredumps in the first cache dir
+coredump_dir /var/spool/squid
+
+# OPTIONS FOR FTP GATEWAYING
+# -----------------------------------------------------------------------------
+
+#  TAG: ftp_user
+#	If you want the anonymous login password to be more informative
+#	(and enable the use of picky FTP servers), set this to something
+#	reasonable for your domain, like wwwuser@somewhere.net
+#
+#	The reason why this is domainless by default is the
+#	request can be made on the behalf of a user in any domain,
+#	depending on how the cache is used.
+#	Some FTP server also validate the email address is valid
+#	(for example perl.com).
+#Default:
+# ftp_user Squid@
+
+#  TAG: ftp_passive
+#	If your firewall does not allow Squid to use passive
+#	connections, turn off this option.
+#
+#	Use of ftp_epsv_all option requires this to be ON.
+#Default:
+# ftp_passive on
+
+#  TAG: ftp_epsv_all
+#	FTP Protocol extensions permit the use of a special "EPSV ALL" command.
+#
+#	NATs may be able to put the connection on a "fast path" through the
+#	translator, as the EPRT command will never be used and therefore,
+#	translation of the data portion of the segments will never be needed.
+#
+#	When a client only expects to do two-way FTP transfers this may be
+#	useful.
+#	If squid finds that it must do a three-way FTP transfer after issuing
+#	an EPSV ALL command, the FTP session will fail.
+#
+#	If you have any doubts about this option do not use it.
+#	Squid will nicely attempt all other connection methods.
+#
+#	Requires ftp_passive to be ON (default) for any effect.
+#Default:
+# ftp_epsv_all off
+
+#  TAG: ftp_epsv
+#	FTP Protocol extensions permit the use of a special "EPSV" command.
+#
+#	NATs may be able to put the connection on a "fast path" through the
+#	translator using EPSV, as the EPRT command will never be used
+#	and therefore, translation of the data portion of the segments
+#	will never be needed.
+#
+#	EPSV is often required to interoperate with FTP servers on IPv6
+#	networks. On the other hand, it may break some IPv4 servers.
+#
+#	By default, EPSV may try EPSV with any FTP server. To fine tune
+#	that decision, you may restrict EPSV to certain clients or servers
+#	using ACLs:
+#
+#		ftp_epsv allow|deny al1 acl2 ...
+#
+#	WARNING: Disabling EPSV may cause problems with external NAT and IPv6.
+#
+#	Only fast ACLs are supported.
+#	Requires ftp_passive to be ON (default) for any effect.
+#Default:
+# none
+
+#  TAG: ftp_eprt
+#	FTP Protocol extensions permit the use of a special "EPRT" command.
+#
+#	This extension provides a protocol neutral alternative to the
+#	IPv4-only PORT command. When supported it enables active FTP data
+#	channels over IPv6 and efficient NAT handling.
+#
+#	Turning this OFF will prevent EPRT being attempted and will skip
+#	straight to using PORT for IPv4 servers.
+#
+#	Some devices are known to not handle this extension correctly and
+#	may result in crashes. Devices which suport EPRT enough to fail
+#	cleanly will result in Squid attempting PORT anyway. This directive
+#	should only be disabled when EPRT results in device failures.
+#
+#	WARNING: Doing so will convert Squid back to the old behavior with all
+#	the related problems with external NAT devices/layers and IPv4-only FTP.
+#Default:
+# ftp_eprt on
+
+#  TAG: ftp_sanitycheck
+#	For security and data integrity reasons Squid by default performs
+#	sanity checks of the addresses of FTP data connections ensure the
+#	data connection is to the requested server. If you need to allow
+#	FTP connections to servers using another IP address for the data
+#	connection turn this off.
+#Default:
+# ftp_sanitycheck on
+
+#  TAG: ftp_telnet_protocol
+#	The FTP protocol is officially defined to use the telnet protocol
+#	as transport channel for the control connection. However, many
+#	implementations are broken and does not respect this aspect of
+#	the FTP protocol.
+#
+#	If you have trouble accessing files with ASCII code 255 in the
+#	path or similar problems involving this ASCII code you can
+#	try setting this directive to off. If that helps, report to the
+#	operator of the FTP server in question that their FTP server
+#	is broken and does not follow the FTP standard.
+#Default:
+# ftp_telnet_protocol on
+
+# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
+# -----------------------------------------------------------------------------
+
+#  TAG: diskd_program
+#	Specify the location of the diskd executable.
+#	Note this is only useful if you have compiled in
+#	diskd as one of the store io modules.
+#Default:
+# diskd_program /usr/lib/squid/diskd
+
+#  TAG: unlinkd_program
+#	Specify the location of the executable for file deletion process.
+#Default:
+# unlinkd_program /usr/lib/squid/unlinkd
+
+#  TAG: pinger_program
+#	Specify the location of the executable for the pinger process.
+#Default:
+# pinger_program /usr/lib/squid/pinger
+
+#  TAG: pinger_enable
+#	Control whether the pinger is active at run-time.
+#	Enables turning ICMP pinger on and off with a simple
+#	squid -k reconfigure.
+#Default:
+# pinger_enable on
+
+# OPTIONS FOR URL REWRITING
+# -----------------------------------------------------------------------------
+
+#  TAG: url_rewrite_program
+#	Specify the location of the executable URL rewriter to use.
+#	Since they can perform almost any function there isn't one included.
+#
+#	For each requested URL, the rewriter will receive on line with the format
+#
+#	  [channel-ID <SP>] URL [<SP> extras]<NL>
+#
+#	See url_rewrite_extras on how to send "extras" with optional values to
+#	the helper.
+#	After processing the request the helper must reply using the following format:
+#
+#	  [channel-ID <SP>] result [<SP> kv-pairs]
+#
+#	The result code can be:
+#
+#	  OK status=30N url="..."
+#		Redirect the URL to the one supplied in 'url='.
+#		'status=' is optional and contains the status code to send
+#		the client in Squids HTTP response. It must be one of the
+#		HTTP redirect status codes: 301, 302, 303, 307, 308.
+#		When no status is given Squid will use 302.
+#
+#	  OK rewrite-url="..."
+#		Rewrite the URL to the one supplied in 'rewrite-url='.
+#		The new URL is fetched directly by Squid and returned to
+#		the client as the response to its request.
+#
+#	  OK
+#		When neither of url= and rewrite-url= are sent Squid does
+#		not change the URL.
+#
+#	  ERR
+#		Do not change the URL.
+#
+#	  BH
+#		An internal error occurred in the helper, preventing
+#		a result being identified. The 'message=' key name is
+#		reserved for delivering a log message.
+#
+#
+#	In addition to the above kv-pairs Squid also understands the following
+#	optional kv-pairs received from URL rewriters:
+#	  clt_conn_tag=TAG
+#		Associates a TAG with the client TCP connection.
+#		The TAG is treated as a regular annotation but persists across
+#		future requests on the client connection rather than just the
+#		current request. A helper may update the TAG during subsequent
+#		requests be returning a new kv-pair.
+#
+#	When using the concurrency= option the protocol is changed by
+#	introducing a query channel tag in front of the request/response.
+#	The query channel tag is a number between 0 and concurrency-1.
+#	This value must be echoed back unchanged to Squid as the first part
+#	of the response relating to its request.
+#
+#	WARNING: URL re-writing ability should be avoided whenever possible.
+#		 Use the URL redirect form of response instead.
+#
+#	Re-write creates a difference in the state held by the client
+#	and server. Possibly causing confusion when the server response
+#	contains snippets of its view state. Embeded URLs, response
+#	and content Location headers, etc. are not re-written by this
+#	interface.
+#
+#	By default, a URL rewriter is not used.
+#Default:
+# none
+
+#  TAG: url_rewrite_children
+#	The maximum number of redirector processes to spawn. If you limit
+#	it too few Squid will have to wait for them to process a backlog of
+#	URLs, slowing it down. If you allow too many they will use RAM
+#	and other system resources noticably.
+#
+#	The startup= and idle= options allow some measure of skew in your
+#	tuning.
+#
+#		startup=
+#
+#	Sets a minimum of how many processes are to be spawned when Squid
+#	starts or reconfigures. When set to zero the first request will
+#	cause spawning of the first child process to handle it.
+#
+#	Starting too few will cause an initial slowdown in traffic as Squid
+#	attempts to simultaneously spawn enough processes to cope.
+#
+#		idle=
+#
+#	Sets a minimum of how many processes Squid is to try and keep available
+#	at all times. When traffic begins to rise above what the existing
+#	processes can handle this many more will be spawned up to the maximum
+#	configured. A minimum setting of 1 is required.
+#
+#		concurrency=
+#
+#	The number of requests each redirector helper can handle in
+#	parallel. Defaults to 0 which indicates the redirector
+#	is a old-style single threaded redirector.
+#
+#	When this directive is set to a value >= 1 then the protocol
+#	used to communicate with the helper is modified to include
+#	an ID in front of the request/response. The ID from the request
+#	must be echoed back with the response to that request.
+#Default:
+# url_rewrite_children 20 startup=0 idle=1 concurrency=0
+
+#  TAG: url_rewrite_host_header
+#	To preserve same-origin security policies in browsers and
+#	prevent Host: header forgery by redirectors Squid rewrites
+#	any Host: header in redirected requests.
+#
+#	If you are running an accelerator this may not be a wanted
+#	effect of a redirector. This directive enables you disable
+#	Host: alteration in reverse-proxy traffic.
+#
+#	WARNING: Entries are cached on the result of the URL rewriting
+#	process, so be careful if you have domain-virtual hosts.
+#
+#	WARNING: Squid and other software verifies the URL and Host
+#	are matching, so be careful not to relay through other proxies
+#	or inspecting firewalls with this disabled.
+#Default:
+# url_rewrite_host_header on
+
+#  TAG: url_rewrite_access
+#	If defined, this access list specifies which requests are
+#	sent to the redirector processes.
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: url_rewrite_bypass
+#	When this is 'on', a request will not go through the
+#	redirector if all the helpers are busy.  If this is 'off'
+#	and the redirector queue grows too large, Squid will exit
+#	with a FATAL error and ask you to increase the number of
+#	redirectors.  You should only enable this if the redirectors
+#	are not critical to your caching system.  If you use
+#	redirectors for access control, and you enable this option,
+#	users may have access to pages they should not
+#	be allowed to request.
+#Default:
+# url_rewrite_bypass off
+
+#  TAG: url_rewrite_extras
+#	Specifies a string to be append to request line format for the
+#	rewriter helper. "Quoted" format values may contain spaces and
+#	logformat %macros. In theory, any logformat %macro can be used.
+#	In practice, a %macro expands as a dash (-) if the helper request is
+#	sent before the required macro information is available to Squid.
+#Default:
+# url_rewrite_extras "%>a/%>A %un %>rm myip=%la myport=%lp"
+
+# OPTIONS FOR STORE ID
+# -----------------------------------------------------------------------------
+
+#  TAG: store_id_program
+#	Specify the location of the executable StoreID helper to use.
+#	Since they can perform almost any function there isn't one included.
+#
+#	For each requested URL, the helper will receive one line with the format
+#
+#	  [channel-ID <SP>] URL [<SP> extras]<NL>
+#
+#
+#	After processing the request the helper must reply using the following format:
+#
+#	  [channel-ID <SP>] result [<SP> kv-pairs]
+#
+#	The result code can be:
+#
+#	  OK store-id="..."
+#		Use the StoreID supplied in 'store-id='.
+#
+#	  ERR
+#		The default is to use HTTP request URL as the store ID.
+#
+#	  BH
+#		An internal error occured in the helper, preventing
+#		a result being identified.
+#
+#	In addition to the above kv-pairs Squid also understands the following
+#	optional kv-pairs received from URL rewriters:
+#	  clt_conn_tag=TAG
+#		Associates a TAG with the client TCP connection.
+#		Please see url_rewrite_program related documentation for this
+#		kv-pair
+#
+#	Helper programs should be prepared to receive and possibly ignore
+#	additional whitespace-separated tokens on each input line.
+#
+#	When using the concurrency= option the protocol is changed by
+#	introducing a query channel tag in front of the request/response.
+#	The query channel tag is a number between 0 and concurrency-1.
+#	This value must be echoed back unchanged to Squid as the first part
+#	of the response relating to its request.
+#
+#	NOTE: when using StoreID refresh_pattern will apply to the StoreID
+#	      returned from the helper and not the URL.
+#
+#	WARNING: Wrong StoreID value returned by a careless helper may result
+#	         in the wrong cached response returned to the user.
+#
+#	By default, a StoreID helper is not used.
+#Default:
+# none
+
+#  TAG: store_id_extras
+#        Specifies a string to be append to request line format for the
+#        StoreId helper. "Quoted" format values may contain spaces and
+#        logformat %macros. In theory, any logformat %macro can be used.
+#        In practice, a %macro expands as a dash (-) if the helper request is
+#        sent before the required macro information is available to Squid.
+#Default:
+# store_id_extras "%>a/%>A %un %>rm myip=%la myport=%lp"
+
+#  TAG: store_id_children
+#	The maximum number of StoreID helper processes to spawn. If you limit
+#	it too few Squid will have to wait for them to process a backlog of
+#	requests, slowing it down. If you allow too many they will use RAM
+#	and other system resources noticably.
+#
+#	The startup= and idle= options allow some measure of skew in your
+#	tuning.
+#
+#		startup=
+#
+#	Sets a minimum of how many processes are to be spawned when Squid
+#	starts or reconfigures. When set to zero the first request will
+#	cause spawning of the first child process to handle it.
+#
+#	Starting too few will cause an initial slowdown in traffic as Squid
+#	attempts to simultaneously spawn enough processes to cope.
+#
+#		idle=
+#
+#	Sets a minimum of how many processes Squid is to try and keep available
+#	at all times. When traffic begins to rise above what the existing
+#	processes can handle this many more will be spawned up to the maximum
+#	configured. A minimum setting of 1 is required.
+#
+#		concurrency=
+#
+#	The number of requests each storeID helper can handle in
+#	parallel. Defaults to 0 which indicates the helper
+#	is a old-style single threaded program.
+#
+#	When this directive is set to a value >= 1 then the protocol
+#	used to communicate with the helper is modified to include
+#	an ID in front of the request/response. The ID from the request
+#	must be echoed back with the response to that request.
+#Default:
+# store_id_children 20 startup=0 idle=1 concurrency=0
+
+#  TAG: store_id_access
+#	If defined, this access list specifies which requests are
+#	sent to the StoreID processes.  By default all requests
+#	are sent.
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: store_id_bypass
+#	When this is 'on', a request will not go through the
+#	helper if all helpers are busy.  If this is 'off'
+#	and the helper queue grows too large, Squid will exit
+#	with a FATAL error and ask you to increase the number of
+#	helpers.  You should only enable this if the helperss
+#	are not critical to your caching system.  If you use
+#	helpers for critical caching components, and you enable this
+#	option,	users may not get objects from cache.
+#Default:
+# store_id_bypass on
+
+# OPTIONS FOR TUNING THE CACHE
+# -----------------------------------------------------------------------------
+
+#  TAG: cache
+#	Requests denied by this directive will not be served from the cache
+#	and their responses will not be stored in the cache. This directive
+#	has no effect on other transactions and on already cached responses.
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#	This and the two other similar caching directives listed below are
+#	checked at different transaction processing stages, have different
+#	access to response information, affect different cache operations,
+#	and differ in slow ACLs support:
+#
+#	* cache: Checked before Squid makes a hit/miss determination.
+#		No access to reply information!
+#		Denies both serving a hit and storing a miss.
+#		Supports both fast and slow ACLs.
+#	* send_hit: Checked after a hit was detected.
+#		Has access to reply (hit) information.
+#		Denies serving a hit only.
+#		Supports fast ACLs only.
+#	* store_miss: Checked before storing a cachable miss.
+#		Has access to reply (miss) information.
+#		Denies storing a miss only.
+#		Supports fast ACLs only.
+#
+#	If you are not sure which of the three directives to use, apply the
+#	following decision logic:
+#
+#	* If your ACL(s) are of slow type _and_ need response info, redesign.
+#	  Squid does not support that particular combination at this time.
+#        Otherwise:
+#	* If your directive ACL(s) are of slow type, use "cache"; and/or
+#	* if your directive ACL(s) need no response info, use "cache".
+#        Otherwise:
+#	* If you do not want the response cached, use store_miss; and/or
+#	* if you do not want a hit on a cached response, use send_hit.
+#Default:
+# By default, this directive is unused and has no effect.
+
+#  TAG: send_hit
+#	Responses denied by this directive will not be served from the cache
+#	(but may still be cached, see store_miss). This directive has no
+#	effect on the responses it allows and on the cached objects.
+#
+#	Please see the "cache" directive for a summary of differences among
+#	store_miss, send_hit, and cache directives.
+#
+#	Unlike the "cache" directive, send_hit only supports fast acl
+#	types.  See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#	For example:
+#
+#		# apply custom Store ID mapping to some URLs
+#		acl MapMe dstdomain .c.example.com
+#		store_id_program ...
+#		store_id_access allow MapMe
+#
+#		# but prevent caching of special responses
+#		# such as 302 redirects that cause StoreID loops
+#		acl Ordinary http_status 200-299
+#		store_miss deny MapMe !Ordinary
+#
+#		# and do not serve any previously stored special responses
+#		# from the cache (in case they were already cached before
+#		# the above store_miss rule was in effect).
+#		send_hit deny MapMe !Ordinary
+#Default:
+# By default, this directive is unused and has no effect.
+
+#  TAG: store_miss
+#	Responses denied by this directive will not be cached (but may still
+#	be served from the cache, see send_hit). This directive has no
+#	effect on the responses it allows and on the already cached responses.
+#
+#	Please see the "cache" directive for a summary of differences among
+#	store_miss, send_hit, and cache directives. See the
+#	send_hit directive for a usage example.
+#
+#	Unlike the "cache" directive, store_miss only supports fast acl
+#	types.  See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# By default, this directive is unused and has no effect.
+
+#  TAG: max_stale	time-units
+#	This option puts an upper limit on how stale content Squid
+#	will serve from the cache if cache validation fails.
+#	Can be overriden by the refresh_pattern max-stale option.
+#Default:
+# max_stale 1 week
+
+#  TAG: refresh_pattern
+#	usage: refresh_pattern [-i] regex min percent max [options]
+#
+#	By default, regular expressions are CASE-SENSITIVE.  To make
+#	them case-insensitive, use the -i option.
+#
+#	'Min' is the time (in minutes) an object without an explicit
+#	expiry time should be considered fresh. The recommended
+#	value is 0, any higher values may cause dynamic applications
+#	to be erroneously cached unless the application designer
+#	has taken the appropriate actions.
+#
+#	'Percent' is a percentage of the objects age (time since last
+#	modification age) an object without explicit expiry time
+#	will be considered fresh.
+#
+#	'Max' is an upper limit on how long objects without an explicit
+#	expiry time will be considered fresh. The value is also used
+#	to form Cache-Control: max-age header for a request sent from
+#	Squid to origin/parent.
+#
+#	options: override-expire
+#		 override-lastmod
+#		 reload-into-ims
+#		 ignore-reload
+#		 ignore-no-store
+#		 ignore-must-revalidate
+#		 ignore-private
+#		 ignore-auth
+#		 max-stale=NN
+#		 refresh-ims
+#		 store-stale
+#
+#		override-expire enforces min age even if the server
+#		sent an explicit expiry time (e.g., with the
+#		Expires: header or Cache-Control: max-age). Doing this
+#		VIOLATES the HTTP standard.  Enabling this feature
+#		could make you liable for problems which it causes.
+#
+#		Note: override-expire does not enforce staleness - it only extends
+#		freshness / min. If the server returns a Expires time which
+#		is longer than your max time, Squid will still consider
+#		the object fresh for that period of time.
+#
+#		override-lastmod enforces min age even on objects
+#		that were modified recently.
+#
+#		reload-into-ims changes a client no-cache or ``reload''
+#		request for a cached entry into a conditional request using
+#		If-Modified-Since and/or If-None-Match headers, provided the
+#		cached entry has a Last-Modified and/or a strong ETag header.
+#		Doing this VIOLATES the HTTP standard. Enabling this feature
+#		could make you liable for problems which it causes.
+#
+#		ignore-reload ignores a client no-cache or ``reload''
+#		header. Doing this VIOLATES the HTTP standard. Enabling
+#		this feature could make you liable for problems which
+#		it causes.
+#
+#		ignore-no-store ignores any ``Cache-control: no-store''
+#		headers received from a server. Doing this VIOLATES
+#		the HTTP standard. Enabling this feature could make you
+#		liable for problems which it causes.
+#
+#		ignore-must-revalidate ignores any ``Cache-Control: must-revalidate``
+#		headers received from a server. Doing this VIOLATES
+#		the HTTP standard. Enabling this feature could make you
+#		liable for problems which it causes.
+#
+#		ignore-private ignores any ``Cache-control: private''
+#		headers received from a server. Doing this VIOLATES
+#		the HTTP standard. Enabling this feature could make you
+#		liable for problems which it causes.
+#
+#		ignore-auth caches responses to requests with authorization,
+#		as if the originserver had sent ``Cache-control: public''
+#		in the response header. Doing this VIOLATES the HTTP standard.
+#		Enabling this feature could make you liable for problems which
+#		it causes.
+#
+#		refresh-ims causes squid to contact the origin server
+#		when a client issues an If-Modified-Since request. This
+#		ensures that the client will receive an updated version
+#		if one is available.
+#
+#		store-stale stores responses even if they don't have explicit
+#		freshness or a validator (i.e., Last-Modified or an ETag)
+#		present, or if they're already stale. By default, Squid will
+#		not cache such responses because they usually can't be
+#		reused. Note that such responses will be stale by default.
+#
+#		max-stale=NN provide a maximum staleness factor. Squid won't
+#		serve objects more stale than this even if it failed to
+#		validate the object. Default: use the max_stale global limit.
+#
+#	Basically a cached object is:
+#
+#		FRESH if expire > now, else STALE
+#		STALE if age > max
+#		FRESH if lm-factor < percent, else STALE
+#		FRESH if age < min
+#		else STALE
+#
+#	The refresh_pattern lines are checked in the order listed here.
+#	The first entry which matches is used.  If none of the entries
+#	match the default will be used.
+#
+#	Note, you must uncomment all the default lines if you want
+#	to change one. The default setting is only active if none is
+#	used.
+#
+#
+
+#
+# Add any of your own refresh_pattern entries above these.
+#
+refresh_pattern ^ftp:		1440	20%	10080
+refresh_pattern ^gopher:	1440	0%	1440
+refresh_pattern -i (/cgi-bin/|\?) 0	0%	0
+refresh_pattern (Release|Packages(.gz)*)$      0       20%     2880
+# example lin deb packages
+#refresh_pattern (\.deb|\.udeb)$   129600 100% 129600
+refresh_pattern .		0	20%	4320
+
+#  TAG: quick_abort_min	(KB)
+#Default:
+# quick_abort_min 16 KB
+
+#  TAG: quick_abort_max	(KB)
+#Default:
+# quick_abort_max 16 KB
+
+#  TAG: quick_abort_pct	(percent)
+#	The cache by default continues downloading aborted requests
+#	which are almost completed (less than 16 KB remaining). This
+#	may be undesirable on slow (e.g. SLIP) links and/or very busy
+#	caches.  Impatient users may tie up file descriptors and
+#	bandwidth by repeatedly requesting and immediately aborting
+#	downloads.
+#
+#	When the user aborts a request, Squid will check the
+#	quick_abort values to the amount of data transferred until
+#	then.
+#
+#	If the transfer has less than 'quick_abort_min' KB remaining,
+#	it will finish the retrieval.
+#
+#	If the transfer has more than 'quick_abort_max' KB remaining,
+#	it will abort the retrieval.
+#
+#	If more than 'quick_abort_pct' of the transfer has completed,
+#	it will finish the retrieval.
+#
+#	If you do not want any retrieval to continue after the client
+#	has aborted, set both 'quick_abort_min' and 'quick_abort_max'
+#	to '0 KB'.
+#
+#	If you want retrievals to always continue if they are being
+#	cached set 'quick_abort_min' to '-1 KB'.
+#Default:
+# quick_abort_pct 95
+
+#  TAG: read_ahead_gap	buffer-size
+#	The amount of data the cache will buffer ahead of what has been
+#	sent to the client when retrieving an object from another server.
+#Default:
+# read_ahead_gap 16 KB
+
+#  TAG: negative_ttl	time-units
+#	Set the Default Time-to-Live (TTL) for failed requests.
+#	Certain types of failures (such as "connection refused" and
+#	"404 Not Found") are able to be negatively-cached for a short time.
+#	Modern web servers should provide Expires: header, however if they
+#	do not this can provide a minimum TTL.
+#	The default is not to cache errors with unknown expiry details.
+#
+#	Note that this is different from negative caching of DNS lookups.
+#
+#	WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#	this feature could make you liable for problems which it
+#	causes.
+#Default:
+# negative_ttl 0 seconds
+
+#  TAG: positive_dns_ttl	time-units
+#	Upper limit on how long Squid will cache positive DNS responses.
+#	Default is 6 hours (360 minutes). This directive must be set
+#	larger than negative_dns_ttl.
+#Default:
+# positive_dns_ttl 6 hours
+
+#  TAG: negative_dns_ttl	time-units
+#	Time-to-Live (TTL) for negative caching of failed DNS lookups.
+#	This also sets the lower cache limit on positive lookups.
+#	Minimum value is 1 second, and it is not recommendable to go
+#	much below 10 seconds.
+#Default:
+# negative_dns_ttl 1 minutes
+
+#  TAG: range_offset_limit	size [acl acl...]
+#	usage: (size) [units] [[!]aclname]
+#
+#	Sets an upper limit on how far (number of bytes) into the file
+#	a Range request	may be to cause Squid to prefetch the whole file.
+#	If beyond this limit, Squid forwards the Range request as it is and
+#	the result is NOT cached.
+#
+#	This is to stop a far ahead range request (lets say start at 17MB)
+#	from making Squid fetch the whole object up to that point before
+#	sending anything to the client.
+#
+#	Multiple range_offset_limit lines may be specified, and they will
+#	be searched from top to bottom on each request until a match is found.
+#	The first match found will be used.  If no line matches a request, the
+#	default limit of 0 bytes will be used.
+#
+#	'size' is the limit specified as a number of units.
+#
+#	'units' specifies whether to use bytes, KB, MB, etc.
+#	If no units are specified bytes are assumed.
+#
+#	A size of 0 causes Squid to never fetch more than the
+#	client requested. (default)
+#
+#	A size of 'none' causes Squid to always fetch the object from the
+#	beginning so it may cache the result. (2.0 style)
+#
+#	'aclname' is the name of a defined ACL.
+#
+#	NP: Using 'none' as the byte value here will override any quick_abort settings
+#	    that may otherwise apply to the range request. The range request will
+#	    be fully fetched from start to finish regardless of the client
+#	    actions. This affects bandwidth usage.
+#Default:
+# none
+
+#  TAG: minimum_expiry_time	(seconds)
+#	The minimum caching time according to (Expires - Date)
+#	headers Squid honors if the object can't be revalidated.
+#	The default is 60 seconds.
+#
+#	In reverse proxy environments it might be desirable to honor
+#	shorter object lifetimes. It is most likely better to make
+#	your server return a meaningful Last-Modified header however.
+#
+#	In ESI environments where page fragments often have short
+#	lifetimes, this will often be best set to 0.
+#Default:
+# minimum_expiry_time 60 seconds
+
+#  TAG: store_avg_object_size	(bytes)
+#	Average object size, used to estimate number of objects your
+#	cache can hold.  The default is 13 KB.
+#
+#	This is used to pre-seed the cache index memory allocation to
+#	reduce expensive reallocate operations while handling clients
+#	traffic. Too-large values may result in memory allocation during
+#	peak traffic, too-small values will result in wasted memory.
+#
+#	Check the cache manager 'info' report metrics for the real
+#	object sizes seen by your Squid before tuning this.
+#Default:
+# store_avg_object_size 13 KB
+
+#  TAG: store_objects_per_bucket
+#	Target number of objects per bucket in the store hash table.
+#	Lowering this value increases the total number of buckets and
+#	also the storage maintenance rate.  The default is 20.
+#Default:
+# store_objects_per_bucket 20
+
+# HTTP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: request_header_max_size	(KB)
+#	This specifies the maximum size for HTTP headers in a request.
+#	Request headers are usually relatively small (about 512 bytes).
+#	Placing a limit on the request header size will catch certain
+#	bugs (for example with persistent connections) and possibly
+#	buffer-overflow or denial-of-service attacks.
+#Default:
+# request_header_max_size 64 KB
+
+#  TAG: reply_header_max_size	(KB)
+#	This specifies the maximum size for HTTP headers in a reply.
+#	Reply headers are usually relatively small (about 512 bytes).
+#	Placing a limit on the reply header size will catch certain
+#	bugs (for example with persistent connections) and possibly
+#	buffer-overflow or denial-of-service attacks.
+#Default:
+# reply_header_max_size 64 KB
+
+#  TAG: request_body_max_size	(bytes)
+#	This specifies the maximum size for an HTTP request body.
+#	In other words, the maximum size of a PUT/POST request.
+#	A user who attempts to send a request with a body larger
+#	than this limit receives an "Invalid Request" error message.
+#	If you set this parameter to a zero (the default), there will
+#	be no limit imposed.
+#
+#	See also client_request_buffer_max_size for an alternative
+#	limitation on client uploads which can be configured.
+#Default:
+# No limit.
+
+#  TAG: client_request_buffer_max_size	(bytes)
+#	This specifies the maximum buffer size of a client request.
+#	It prevents squid eating too much memory when somebody uploads
+#	a large file.
+#Default:
+# client_request_buffer_max_size 512 KB
+
+#  TAG: broken_posts
+#	A list of ACL elements which, if matched, causes Squid to send
+#	an extra CRLF pair after the body of a PUT/POST request.
+#
+#	Some HTTP servers has broken implementations of PUT/POST,
+#	and rely on an extra CRLF pair sent by some WWW clients.
+#
+#	Quote from RFC2616 section 4.1 on this matter:
+#
+#	  Note: certain buggy HTTP/1.0 client implementations generate an
+#	  extra CRLF's after a POST request. To restate what is explicitly
+#	  forbidden by the BNF, an HTTP/1.1 client must not preface or follow
+#	  a request with an extra CRLF.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#Example:
+# acl buggy_server url_regex ^http://....
+# broken_posts allow buggy_server
+#Default:
+# Obey RFC 2616.
+
+#  TAG: adaptation_uses_indirect_client	on|off
+#	Controls whether the indirect client IP address (instead of the direct
+#	client IP address) is passed to adaptation services.
+#
+#	See also: follow_x_forwarded_for adaptation_send_client_ip
+#Default:
+# adaptation_uses_indirect_client on
+
+#  TAG: via	on|off
+#	If set (default), Squid will include a Via header in requests and
+#	replies as required by RFC2616.
+#Default:
+# via on
+
+#  TAG: ie_refresh	on|off
+#	Microsoft Internet Explorer up until version 5.5 Service
+#	Pack 1 has an issue with transparent proxies, wherein it
+#	is impossible to force a refresh.  Turning this on provides
+#	a partial fix to the problem, by causing all IMS-REFRESH
+#	requests from older IE versions to check the origin server
+#	for fresh content.  This reduces hit ratio by some amount
+#	(~10% in my experience), but allows users to actually get
+#	fresh content when they want it.  Note because Squid
+#	cannot tell if the user is using 5.5 or 5.5SP1, the behavior
+#	of 5.5 is unchanged from old versions of Squid (i.e. a
+#	forced refresh is impossible).  Newer versions of IE will,
+#	hopefully, continue to have the new behavior and will be
+#	handled based on that assumption.  This option defaults to
+#	the old Squid behavior, which is better for hit ratios but
+#	worse for clients using IE, if they need to be able to
+#	force fresh content.
+#Default:
+# ie_refresh off
+
+#  TAG: vary_ignore_expire	on|off
+#	Many HTTP servers supporting Vary gives such objects
+#	immediate expiry time with no cache-control header
+#	when requested by a HTTP/1.0 client. This option
+#	enables Squid to ignore such expiry times until
+#	HTTP/1.1 is fully implemented.
+#
+#	WARNING: If turned on this may eventually cause some
+#	varying objects not intended for caching to get cached.
+#Default:
+# vary_ignore_expire off
+
+#  TAG: request_entities
+#	Squid defaults to deny GET and HEAD requests with request entities,
+#	as the meaning of such requests are undefined in the HTTP standard
+#	even if not explicitly forbidden.
+#
+#	Set this directive to on if you have clients which insists
+#	on sending request entities in GET or HEAD requests. But be warned
+#	that there is server software (both proxies and web servers) which
+#	can fail to properly process this kind of request which may make you
+#	vulnerable to cache pollution attacks if enabled.
+#Default:
+# request_entities off
+
+#  TAG: request_header_access
+#	Usage: request_header_access header_name allow|deny [!]aclname ...
+#
+#	WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#	this feature could make you liable for problems which it
+#	causes.
+#
+#	This option replaces the old 'anonymize_headers' and the
+#	older 'http_anonymizer' option with something that is much
+#	more configurable. A list of ACLs for each header name allows
+#	removal of specific header fields under specific conditions.
+#
+#	This option only applies to outgoing HTTP request headers (i.e.,
+#	headers sent by Squid to the next HTTP hop such as a cache peer
+#	or an origin server). The option has no effect during cache hit
+#	detection. The equivalent adaptation vectoring point in ICAP
+#	terminology is post-cache REQMOD.
+#
+#	The option is applied to individual outgoing request header
+#	fields. For each request header field F, Squid uses the first
+#	qualifying sets of request_header_access rules:
+#
+#	    1. Rules with header_name equal to F's name.
+#	    2. Rules with header_name 'Other', provided F's name is not
+#	       on the hard-coded list of commonly used HTTP header names.
+#	    3. Rules with header_name 'All'.
+#
+#	Within that qualifying rule set, rule ACLs are checked as usual.
+#	If ACLs of an "allow" rule match, the header field is allowed to
+#	go through as is. If ACLs of a "deny" rule match, the header is
+#	removed and request_header_replace is then checked to identify
+#	if the removed header has a replacement. If no rules within the
+#	set have matching ACLs, the header field is left as is.
+#
+#	For example, to achieve the same behavior as the old
+#	'http_anonymizer standard' option, you should use:
+#
+#		request_header_access From deny all
+#		request_header_access Referer deny all
+#		request_header_access User-Agent deny all
+#
+#	Or, to reproduce the old 'http_anonymizer paranoid' feature
+#	you should use:
+#
+#		request_header_access Authorization allow all
+#		request_header_access Proxy-Authorization allow all
+#		request_header_access Cache-Control allow all
+#		request_header_access Content-Length allow all
+#		request_header_access Content-Type allow all
+#		request_header_access Date allow all
+#		request_header_access Host allow all
+#		request_header_access If-Modified-Since allow all
+#		request_header_access Pragma allow all
+#		request_header_access Accept allow all
+#		request_header_access Accept-Charset allow all
+#		request_header_access Accept-Encoding allow all
+#		request_header_access Accept-Language allow all
+#		request_header_access Connection allow all
+#		request_header_access All deny all
+#
+#	HTTP reply headers are controlled with the reply_header_access directive.
+#
+#	By default, all headers are allowed (no anonymizing is performed).
+#Default:
+# No limits.
+
+#  TAG: reply_header_access
+#	Usage: reply_header_access header_name allow|deny [!]aclname ...
+#
+#	WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#	this feature could make you liable for problems which it
+#	causes.
+#
+#	This option only applies to reply headers, i.e., from the
+#	server to the client.
+#
+#	This is the same as request_header_access, but in the other
+#	direction. Please see request_header_access for detailed
+#	documentation.
+#
+#	For example, to achieve the same behavior as the old
+#	'http_anonymizer standard' option, you should use:
+#
+#		reply_header_access Server deny all
+#		reply_header_access WWW-Authenticate deny all
+#		reply_header_access Link deny all
+#
+#	Or, to reproduce the old 'http_anonymizer paranoid' feature
+#	you should use:
+#
+#		reply_header_access Allow allow all
+#		reply_header_access WWW-Authenticate allow all
+#		reply_header_access Proxy-Authenticate allow all
+#		reply_header_access Cache-Control allow all
+#		reply_header_access Content-Encoding allow all
+#		reply_header_access Content-Length allow all
+#		reply_header_access Content-Type allow all
+#		reply_header_access Date allow all
+#		reply_header_access Expires allow all
+#		reply_header_access Last-Modified allow all
+#		reply_header_access Location allow all
+#		reply_header_access Pragma allow all
+#		reply_header_access Content-Language allow all
+#		reply_header_access Retry-After allow all
+#		reply_header_access Title allow all
+#		reply_header_access Content-Disposition allow all
+#		reply_header_access Connection allow all
+#		reply_header_access All deny all
+#
+#	HTTP request headers are controlled with the request_header_access directive.
+#
+#	By default, all headers are allowed (no anonymizing is
+#	performed).
+#Default:
+# No limits.
+
+#  TAG: request_header_replace
+#	Usage:   request_header_replace header_name message
+#	Example: request_header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit)
+#
+#	This option allows you to change the contents of headers
+#	denied with request_header_access above, by replacing them
+#	with some fixed string.
+#
+#	This only applies to request headers, not reply headers.
+#
+#	By default, headers are removed if denied.
+#Default:
+# none
+
+#  TAG: reply_header_replace
+#        Usage:   reply_header_replace header_name message
+#        Example: reply_header_replace Server Foo/1.0
+#
+#        This option allows you to change the contents of headers
+#        denied with reply_header_access above, by replacing them
+#        with some fixed string.
+#
+#        This only applies to reply headers, not request headers.
+#
+#        By default, headers are removed if denied.
+#Default:
+# none
+
+#  TAG: request_header_add
+#	Usage:   request_header_add field-name field-value acl1 [acl2] ...
+#	Example: request_header_add X-Client-CA "CA=%ssl::>cert_issuer" all
+#
+#	This option adds header fields to outgoing HTTP requests (i.e.,
+#	request headers sent by Squid to the next HTTP hop such as a
+#	cache peer or an origin server). The option has no effect during
+#	cache hit detection. The equivalent adaptation vectoring point
+#	in ICAP terminology is post-cache REQMOD.
+#
+#	Field-name is a token specifying an HTTP header name. If a
+#	standard HTTP header name is used, Squid does not check whether
+#	the new header conflicts with any existing headers or violates
+#	HTTP rules. If the request to be modified already contains a
+#	field with the same name, the old field is preserved but the
+#	header field values are not merged.
+#
+#	Field-value is either a token or a quoted string. If quoted
+#	string format is used, then the surrounding quotes are removed
+#	while escape sequences and %macros are processed.
+#
+#	In theory, all of the logformat codes can be used as %macros.
+#	However, unlike logging (which happens at the very end of
+#	transaction lifetime), the transaction may not yet have enough
+#	information to expand a macro when the new header value is needed.
+#	And some information may already be available to Squid but not yet
+#	committed where the macro expansion code can access it (report
+#	such instances!). The macro will be expanded into a single dash
+#	('-') in such cases. Not all macros have been tested.
+#
+#	One or more Squid ACLs may be specified to restrict header
+#	injection to matching requests. As always in squid.conf, all
+#	ACLs in an option ACL list must be satisfied for the insertion
+#	to happen. The request_header_add option supports fast ACLs
+#	only.
+#Default:
+# none
+
+#  TAG: note
+#	This option used to log custom information about the master
+#	transaction. For example, an admin may configure Squid to log
+#	which "user group" the transaction belongs to, where "user group"
+#	will be determined based on a set of ACLs and not [just]
+#	authentication information.
+#	Values of key/value pairs can be logged using %{key}note macros:
+#
+#	    note key value acl ...
+#	    logformat myFormat ... %{key}note ...
+#Default:
+# none
+
+#  TAG: relaxed_header_parser	on|off|warn
+#	In the default "on" setting Squid accepts certain forms
+#	of non-compliant HTTP messages where it is unambiguous
+#	what the sending application intended even if the message
+#	is not correctly formatted. The messages is then normalized
+#	to the correct form when forwarded by Squid.
+#
+#	If set to "warn" then a warning will be emitted in cache.log
+#	each time such HTTP error is encountered.
+#
+#	If set to "off" then such HTTP errors will cause the request
+#	or response to be rejected.
+#Default:
+# relaxed_header_parser on
+
+#  TAG: collapsed_forwarding	(on|off)
+#       When enabled, instead of forwarding each concurrent request for
+#       the same URL, Squid just sends the first of them. The other, so
+#       called "collapsed" requests, wait for the response to the first
+#       request and, if it happens to be cachable, use that response.
+#       Here, "concurrent requests" means "received after the first
+#       request headers were parsed and before the corresponding response
+#       headers were parsed".
+#
+#       This feature is disabled by default: enabling collapsed
+#       forwarding needlessly delays forwarding requests that look
+#       cachable (when they are collapsed) but then need to be forwarded
+#       individually anyway because they end up being for uncachable
+#       content. However, in some cases, such as acceleration of highly
+#       cachable content with periodic or grouped expiration times, the
+#       gains from collapsing [large volumes of simultaneous refresh
+#       requests] outweigh losses from such delays.
+#
+#       Squid collapses two kinds of requests: regular client requests
+#       received on one of the listening ports and internal "cache
+#       revalidation" requests which are triggered by those regular
+#       requests hitting a stale cached object. Revalidation collapsing
+#       is currently disabled for Squid instances containing SMP-aware
+#       disk or memory caches and for Vary-controlled cached objects.
+#Default:
+# collapsed_forwarding off
+
+# TIMEOUTS
+# -----------------------------------------------------------------------------
+
+#  TAG: forward_timeout	time-units
+#	This parameter specifies how long Squid should at most attempt in
+#	finding a forwarding path for the request before giving up.
+#Default:
+# forward_timeout 4 minutes
+
+#  TAG: connect_timeout	time-units
+#	This parameter specifies how long to wait for the TCP connect to
+#	the requested server or peer to complete before Squid should
+#	attempt to find another path where to forward the request.
+#Default:
+# connect_timeout 1 minute
+
+#  TAG: peer_connect_timeout	time-units
+#	This parameter specifies how long to wait for a pending TCP
+#	connection to a peer cache.  The default is 30 seconds.   You
+#	may also set different timeout values for individual neighbors
+#	with the 'connect-timeout' option on a 'cache_peer' line.
+#Default:
+# peer_connect_timeout 30 seconds
+
+#  TAG: read_timeout	time-units
+#	Applied on peer server connections.
+#
+#	After each successful read(), the timeout will be extended by this
+#	amount.  If no data is read again after this amount of time,
+#	the request is aborted and logged with ERR_READ_TIMEOUT.
+#
+#	The default is 15 minutes.
+#Default:
+# read_timeout 15 minutes
+
+#  TAG: write_timeout	time-units
+#	This timeout is tracked for all connections that have data
+#	available for writing and are waiting for the socket to become
+#	ready. After each successful write, the timeout is extended by
+#	the configured amount. If Squid has data to write but the
+#	connection is not ready for the configured duration, the
+#	transaction associated with the connection is terminated. The
+#	default is 15 minutes.
+#Default:
+# write_timeout 15 minutes
+
+#  TAG: request_timeout
+#	How long to wait for complete HTTP request headers after initial
+#	connection establishment.
+#Default:
+# request_timeout 5 minutes
+
+#  TAG: client_idle_pconn_timeout
+#	How long to wait for the next HTTP request on a persistent
+#	client connection after the previous request completes.
+#Default:
+# client_idle_pconn_timeout 2 minutes
+
+#  TAG: ftp_client_idle_timeout
+#	How long to wait for an FTP request on a connection to Squid ftp_port.
+#	Many FTP clients do not deal with idle connection closures well,
+#	necessitating a longer default timeout than client_idle_pconn_timeout
+#	used for incoming HTTP requests.
+#Default:
+# ftp_client_idle_timeout 30 minutes
+
+#  TAG: client_lifetime	time-units
+#	The maximum amount of time a client (browser) is allowed to
+#	remain connected to the cache process.  This protects the Cache
+#	from having a lot of sockets (and hence file descriptors) tied up
+#	in a CLOSE_WAIT state from remote clients that go away without
+#	properly shutting down (either because of a network failure or
+#	because of a poor client implementation).  The default is one
+#	day, 1440 minutes.
+#
+#	NOTE:  The default value is intended to be much larger than any
+#	client would ever need to be connected to your cache.  You
+#	should probably change client_lifetime only as a last resort.
+#	If you seem to have many client connections tying up
+#	filedescriptors, we recommend first tuning the read_timeout,
+#	request_timeout, persistent_request_timeout and quick_abort values.
+#Default:
+# client_lifetime 1 day
+
+#  TAG: half_closed_clients
+#	Some clients may shutdown the sending side of their TCP
+#	connections, while leaving their receiving sides open.	Sometimes,
+#	Squid can not tell the difference between a half-closed and a
+#	fully-closed TCP connection.
+#
+#	By default, Squid will immediately close client connections when
+#	read(2) returns "no more data to read."
+#
+#	Change this option to 'on' and Squid will keep open connections
+#	until a read(2) or write(2) on the socket returns an error.
+#	This may show some benefits for reverse proxies. But if not
+#	it is recommended to leave OFF.
+#Default:
+# half_closed_clients off
+
+#  TAG: server_idle_pconn_timeout
+#	Timeout for idle persistent connections to servers and other
+#	proxies.
+#Default:
+# server_idle_pconn_timeout 1 minute
+
+#  TAG: ident_timeout
+#	Maximum time to wait for IDENT lookups to complete.
+#
+#	If this is too high, and you enabled IDENT lookups from untrusted
+#	users, you might be susceptible to denial-of-service by having
+#	many ident requests going at once.
+#Default:
+# ident_timeout 10 seconds
+
+#  TAG: shutdown_lifetime	time-units
+#	When SIGTERM or SIGHUP is received, the cache is put into
+#	"shutdown pending" mode until all active sockets are closed.
+#	This value is the lifetime to set for all open descriptors
+#	during shutdown mode.  Any active clients after this many
+#	seconds will receive a 'timeout' message.
+#Default:
+# shutdown_lifetime 30 seconds
+
+# ADMINISTRATIVE PARAMETERS
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_mgr
+#	Email-address of local cache manager who will receive
+#	mail if the cache dies.  The default is "webmaster".
+#Default:
+# cache_mgr webmaster
+
+#  TAG: mail_from
+#	From: email-address for mail sent when the cache dies.
+#	The default is to use 'squid@unique_hostname'.
+#
+#	See also: unique_hostname directive.
+#Default:
+# none
+
+#  TAG: mail_program
+#	Email program used to send mail if the cache dies.
+#	The default is "mail". The specified program must comply
+#	with the standard Unix mail syntax:
+#	  mail-program recipient < mailfile
+#
+#	Optional command line options can be specified.
+#Default:
+# mail_program mail
+
+#  TAG: cache_effective_user
+#	If you start Squid as root, it will change its effective/real
+#	UID/GID to the user specified below.  The default is to change
+#	to UID of proxy.
+#	see also; cache_effective_group
+#Default:
+# cache_effective_user proxy
+
+#  TAG: cache_effective_group
+#	Squid sets the GID to the effective user's default group ID
+#	(taken from the password file) and supplementary group list
+#	from the groups membership.
+#
+#	If you want Squid to run with a specific GID regardless of
+#	the group memberships of the effective user then set this
+#	to the group (or GID) you want Squid to run as. When set
+#	all other group privileges of the effective user are ignored
+#	and only this GID is effective. If Squid is not started as
+#	root the user starting Squid MUST be member of the specified
+#	group.
+#
+#	This option is not recommended by the Squid Team.
+#	Our preference is for administrators to configure a secure
+#	user account for squid with UID/GID matching system policies.
+#Default:
+# Use system group memberships of the cache_effective_user account
+
+#  TAG: httpd_suppress_version_string	on|off
+#	Suppress Squid version string info in HTTP headers and HTML error pages.
+#Default:
+# httpd_suppress_version_string off
+
+#  TAG: visible_hostname
+#	If you want to present a special hostname in error messages, etc,
+#	define this.  Otherwise, the return value of gethostname()
+#	will be used. If you have multiple caches in a cluster and
+#	get errors about IP-forwarding you must set them to have individual
+#	names with this setting.
+#Default:
+# Automatically detect the system host name
+
+#  TAG: unique_hostname
+#	If you want to have multiple machines with the same
+#	'visible_hostname' you must give each machine a different
+#	'unique_hostname' so forwarding loops can be detected.
+#Default:
+# Copy the value from visible_hostname
+
+#  TAG: hostname_aliases
+#	A list of other DNS names your cache has.
+#Default:
+# none
+
+#  TAG: umask
+#	Minimum umask which should be enforced while the proxy
+#	is running, in addition to the umask set at startup.
+#
+#	For a traditional octal representation of umasks, start
+#        your value with 0.
+#Default:
+# umask 027
+
+# OPTIONS FOR THE CACHE REGISTRATION SERVICE
+# -----------------------------------------------------------------------------
+#
+#	This section contains parameters for the (optional) cache
+#	announcement service.  This service is provided to help
+#	cache administrators locate one another in order to join or
+#	create cache hierarchies.
+#
+#	An 'announcement' message is sent (via UDP) to the registration
+#	service by Squid.  By default, the announcement message is NOT
+#	SENT unless you enable it with 'announce_period' below.
+#
+#	The announcement message includes your hostname, plus the
+#	following information from this configuration file:
+#
+#		http_port
+#		icp_port
+#		cache_mgr
+#
+#	All current information is processed regularly and made
+#	available on the Web at http://www.ircache.net/Cache/Tracker/.
+
+#  TAG: announce_period
+#	This is how frequently to send cache announcements.
+#
+#	To enable announcing your cache, just set an announce period.
+#
+#	Example:
+#		announce_period 1 day
+#Default:
+# Announcement messages disabled.
+
+#  TAG: announce_host
+#	Set the hostname where announce registration messages will be sent.
+#
+#	See also announce_port and announce_file
+#Default:
+# announce_host tracker.ircache.net
+
+#  TAG: announce_file
+#	The contents of this file will be included in the announce
+#	registration messages.
+#Default:
+# none
+
+#  TAG: announce_port
+#	Set the port where announce registration messages will be sent.
+#
+#	See also announce_host and announce_file
+#Default:
+# announce_port 3131
+
+# HTTPD-ACCELERATOR OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: httpd_accel_surrogate_id
+#	Surrogates (http://www.esi.org/architecture_spec_1.0.html)
+#	need an identification token to allow control targeting. Because
+#	a farm of surrogates may all perform the same tasks, they may share
+#	an identification token.
+#Default:
+# visible_hostname is used if no specific ID is set.
+
+#  TAG: http_accel_surrogate_remote	on|off
+#	Remote surrogates (such as those in a CDN) honour the header
+#	"Surrogate-Control: no-store-remote".
+#
+#	Set this to on to have squid behave as a remote surrogate.
+#Default:
+# http_accel_surrogate_remote off
+
+#  TAG: esi_parser	libxml2|expat|custom
+#	ESI markup is not strictly XML compatible. The custom ESI parser
+#	will give higher performance, but cannot handle non ASCII character
+#	encodings.
+#Default:
+# esi_parser custom
+
+# DELAY POOL PARAMETERS
+# -----------------------------------------------------------------------------
+
+#  TAG: delay_pools
+#	This represents the number of delay pools to be used.  For example,
+#	if you have one class 2 delay pool and one class 3 delays pool, you
+#	have a total of 2 delay pools.
+#
+#	See also delay_parameters, delay_class, delay_access for pool
+#	configuration details.
+#Default:
+# delay_pools 0
+
+#  TAG: delay_class
+#	This defines the class of each delay pool.  There must be exactly one
+#	delay_class line for each delay pool.  For example, to define two
+#	delay pools, one of class 2 and one of class 3, the settings above
+#	and here would be:
+#
+#	Example:
+#	    delay_pools 4      # 4 delay pools
+#	    delay_class 1 2    # pool 1 is a class 2 pool
+#	    delay_class 2 3    # pool 2 is a class 3 pool
+#	    delay_class 3 4    # pool 3 is a class 4 pool
+#	    delay_class 4 5    # pool 4 is a class 5 pool
+#
+#	The delay pool classes are:
+#
+#		class 1		Everything is limited by a single aggregate
+#				bucket.
+#
+#		class 2 	Everything is limited by a single aggregate
+#				bucket as well as an "individual" bucket chosen
+#				from bits 25 through 32 of the IPv4 address.
+#
+#		class 3		Everything is limited by a single aggregate
+#				bucket as well as a "network" bucket chosen
+#				from bits 17 through 24 of the IP address and a
+#				"individual" bucket chosen from bits 17 through
+#				32 of the IPv4 address.
+#
+#		class 4		Everything in a class 3 delay pool, with an
+#				additional limit on a per user basis. This
+#				only takes effect if the username is established
+#				in advance - by forcing authentication in your
+#				http_access rules.
+#
+#		class 5		Requests are grouped according their tag (see
+#				external_acl's tag= reply).
+#
+#
+#	Each pool also requires a delay_parameters directive to configure the pool size
+#	and speed limits used whenever the pool is applied to a request. Along with
+#	a set of delay_access directives to determine when it is used.
+#
+#	NOTE: If an IP address is a.b.c.d
+#		-> bits 25 through 32 are "d"
+#		-> bits 17 through 24 are "c"
+#		-> bits 17 through 32 are "c * 256 + d"
+#
+#	NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to
+#		IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic.
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#	See also delay_parameters and delay_access.
+#Default:
+# none
+
+#  TAG: delay_access
+#	This is used to determine which delay pool a request falls into.
+#
+#	delay_access is sorted per pool and the matching starts with pool 1,
+#	then pool 2, ..., and finally pool N. The first delay pool where the
+#	request is allowed is selected for the request. If it does not allow
+#	the request to any pool then the request is not delayed (default).
+#
+#	For example, if you want some_big_clients in delay
+#	pool 1 and lotsa_little_clients in delay pool 2:
+#
+#		delay_access 1 allow some_big_clients
+#		delay_access 1 deny all
+#		delay_access 2 allow lotsa_little_clients
+#		delay_access 2 deny all
+#		delay_access 3 allow authenticated_clients
+#
+#	See also delay_parameters and delay_class.
+#
+#Default:
+# Deny using the pool, unless allow rules exist in squid.conf for the pool.
+
+#  TAG: delay_parameters
+#	This defines the parameters for a delay pool.  Each delay pool has
+#	a number of "buckets" associated with it, as explained in the
+#	description of delay_class.
+#
+#	For a class 1 delay pool, the syntax is:
+#		delay_class pool 1
+#		delay_parameters pool aggregate
+#
+#	For a class 2 delay pool:
+#		delay_class pool 2
+#		delay_parameters pool aggregate individual
+#
+#	For a class 3 delay pool:
+#		delay_class pool 3
+#		delay_parameters pool aggregate network individual
+#
+#	For a class 4 delay pool:
+#		delay_class pool 4
+#		delay_parameters pool aggregate network individual user
+#
+#	For a class 5 delay pool:
+#		delay_class pool 5
+#		delay_parameters pool tagrate
+#
+#	The option variables are:
+#
+#		pool		a pool number - ie, a number between 1 and the
+#				number specified in delay_pools as used in
+#				delay_class lines.
+#
+#		aggregate	the speed limit parameters for the aggregate bucket
+#				(class 1, 2, 3).
+#
+#		individual	the speed limit parameters for the individual
+#				buckets (class 2, 3).
+#
+#		network		the speed limit parameters for the network buckets
+#				(class 3).
+#
+#		user		the speed limit parameters for the user buckets
+#				(class 4).
+#
+#		tagrate		the speed limit parameters for the tag buckets
+#				(class 5).
+#
+#	A pair of delay parameters is written restore/maximum, where restore is
+#	the number of bytes (not bits - modem and network speeds are usually
+#	quoted in bits) per second placed into the bucket, and maximum is the
+#	maximum number of bytes which can be in the bucket at any time.
+#
+#	There must be one delay_parameters line for each delay pool.
+#
+#
+#	For example, if delay pool number 1 is a class 2 delay pool as in the
+#	above example, and is being used to strictly limit each host to 64Kbit/sec
+#	(plus overheads), with no overall limit, the line is:
+#
+#		delay_parameters 1 none 8000/8000
+#
+#	Note that 8 x 8K Byte/sec -> 64K bit/sec.
+#
+#	Note that the word 'none' is used to represent no limit.
+#
+#
+#	And, if delay pool number 2 is a class 3 delay pool as in the above
+#	example, and you want to limit it to a total of 256Kbit/sec (strict limit)
+#	with each 8-bit network permitted 64Kbit/sec (strict limit) and each
+#	individual host permitted 4800bit/sec with a bucket maximum size of 64Kbits
+#	to permit a decent web page to be downloaded at a decent speed
+#	(if the network is not being limited due to overuse) but slow down
+#	large downloads more significantly:
+#
+#		delay_parameters 2 32000/32000 8000/8000 600/8000
+#
+#	Note that 8 x  32K Byte/sec ->  256K bit/sec.
+#		  8 x   8K Byte/sec ->   64K bit/sec.
+#		  8 x 600  Byte/sec -> 4800  bit/sec.
+#
+#
+#	Finally, for a class 4 delay pool as in the example - each user will
+#	be limited to 128Kbits/sec no matter how many workstations they are logged into.:
+#
+#		delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000
+#
+#
+#	See also delay_class and delay_access.
+#
+#Default:
+# none
+
+#  TAG: delay_initial_bucket_level	(percent, 0-100)
+#	The initial bucket percentage is used to determine how much is put
+#	in each bucket when squid starts, is reconfigured, or first notices
+#	a host accessing it (in class 2 and class 3, individual hosts and
+#	networks only have buckets associated with them once they have been
+#	"seen" by squid).
+#Default:
+# delay_initial_bucket_level 50
+
+# CLIENT DELAY POOL PARAMETERS
+# -----------------------------------------------------------------------------
+
+#  TAG: client_delay_pools
+#	This option specifies the number of client delay pools used. It must
+#	preceed other client_delay_* options.
+#
+#	Example:
+#		client_delay_pools 2
+#
+#	See also client_delay_parameters and client_delay_access.
+#Default:
+# client_delay_pools 0
+
+#  TAG: client_delay_initial_bucket_level	(percent, 0-no_limit)
+#	This option determines the initial bucket size as a percentage of
+#	max_bucket_size from client_delay_parameters. Buckets are created
+#	at the time of the "first" connection from the matching IP. Idle
+#	buckets are periodically deleted up.
+#
+#	You can specify more than 100 percent but note that such "oversized"
+#	buckets are not refilled until their size goes down to max_bucket_size
+#	from client_delay_parameters.
+#
+#	Example:
+#		client_delay_initial_bucket_level 50
+#Default:
+# client_delay_initial_bucket_level 50
+
+#  TAG: client_delay_parameters
+#
+#	This option configures client-side bandwidth limits using the
+#	following format:
+#
+#	    client_delay_parameters pool speed_limit max_bucket_size
+#
+#	pool is an integer ID used for client_delay_access matching.
+#
+#	speed_limit is bytes added to the bucket per second.
+#
+#	max_bucket_size is the maximum size of a bucket, enforced after any
+#	speed_limit additions.
+#
+#	Please see the delay_parameters option for more information and
+#	examples.
+#
+#	Example:
+#		client_delay_parameters 1 1024 2048
+#		client_delay_parameters 2 51200 16384
+#
+#	See also client_delay_access.
+#
+#Default:
+# none
+
+#  TAG: client_delay_access
+#	This option determines the client-side delay pool for the
+#	request:
+#
+#	    client_delay_access pool_ID allow|deny acl_name
+#
+#	All client_delay_access options are checked in their pool ID
+#	order, starting with pool 1. The first checked pool with allowed
+#	request is selected for the request. If no ACL matches or there
+#	are no client_delay_access options, the request bandwidth is not
+#	limited.
+#
+#	The ACL-selected pool is then used to find the
+#	client_delay_parameters for the request. Client-side pools are
+#	not used to aggregate clients. Clients are always aggregated
+#	based on their source IP addresses (one bucket per source IP).
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#	Additionally, only the client TCP connection details are available.
+#	ACLs testing HTTP properties will not work.
+#
+#	Please see delay_access for more examples.
+#
+#	Example:
+#		client_delay_access 1 allow low_rate_network
+#		client_delay_access 2 allow vips_network
+#
+#
+#	See also client_delay_parameters and client_delay_pools.
+#Default:
+# Deny use of the pool, unless allow rules exist in squid.conf for the pool.
+
+# WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: wccp_router
+#	Use this option to define your WCCP ``home'' router for
+#	Squid.
+#
+#	wccp_router supports a single WCCP(v1) router
+#
+#	wccp2_router supports multiple WCCPv2 routers
+#
+#	only one of the two may be used at the same time and defines
+#	which version of WCCP to use.
+#Default:
+# WCCP disabled.
+
+#  TAG: wccp2_router
+#	Use this option to define your WCCP ``home'' router for
+#	Squid.
+#
+#	wccp_router supports a single WCCP(v1) router
+#
+#	wccp2_router supports multiple WCCPv2 routers
+#
+#	only one of the two may be used at the same time and defines
+#	which version of WCCP to use.
+#Default:
+# WCCPv2 disabled.
+
+#  TAG: wccp_version
+#	This directive is only relevant if you need to set up WCCP(v1)
+#	to some very old and end-of-life Cisco routers. In all other
+#	setups it must be left unset or at the default setting.
+#	It defines an internal version in the WCCP(v1) protocol,
+#	with version 4 being the officially documented protocol.
+#
+#	According to some users, Cisco IOS 11.2 and earlier only
+#	support WCCP version 3.  If you're using that or an earlier
+#	version of IOS, you may need to change this value to 3, otherwise
+#	do not specify this parameter.
+#Default:
+# wccp_version 4
+
+#  TAG: wccp2_rebuild_wait
+#	If this is enabled Squid will wait for the cache dir rebuild to finish
+#	before sending the first wccp2 HereIAm packet
+#Default:
+# wccp2_rebuild_wait on
+
+#  TAG: wccp2_forwarding_method
+#	WCCP2 allows the setting of forwarding methods between the
+#	router/switch and the cache.  Valid values are as follows:
+#
+#	gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
+#	l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)
+#
+#	Currently (as of IOS 12.4) cisco routers only support GRE.
+#	Cisco switches only support the L2 redirect assignment method.
+#Default:
+# wccp2_forwarding_method gre
+
+#  TAG: wccp2_return_method
+#	WCCP2 allows the setting of return methods between the
+#	router/switch and the cache for packets that the cache
+#	decides not to handle.  Valid values are as follows:
+#
+#	gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
+#	l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)
+#
+#	Currently (as of IOS 12.4) cisco routers only support GRE.
+#	Cisco switches only support the L2 redirect assignment.
+#
+#	If the "ip wccp redirect exclude in" command has been
+#	enabled on the cache interface, then it is still safe for
+#	the proxy server to use a l2 redirect method even if this
+#	option is set to GRE.
+#Default:
+# wccp2_return_method gre
+
+#  TAG: wccp2_assignment_method
+#	WCCP2 allows the setting of methods to assign the WCCP hash
+#	Valid values are as follows:
+#
+#	hash - Hash assignment
+#	mask - Mask assignment
+#
+#	As a general rule, cisco routers support the hash assignment method
+#	and cisco switches support the mask assignment method.
+#Default:
+# wccp2_assignment_method hash
+
+#  TAG: wccp2_service
+#	WCCP2 allows for multiple traffic services. There are two
+#	types: "standard" and "dynamic". The standard type defines
+#	one service id - http (id 0). The dynamic service ids can be from
+#	51 to 255 inclusive.  In order to use a dynamic service id
+#	one must define the type of traffic to be redirected; this is done
+#	using the wccp2_service_info option.
+#
+#	The "standard" type does not require a wccp2_service_info option,
+#	just specifying the service id will suffice.
+#
+#	MD5 service authentication can be enabled by adding
+#	"password=<password>" to the end of this service declaration.
+#
+#	Examples:
+#
+#	wccp2_service standard 0	# for the 'web-cache' standard service
+#	wccp2_service dynamic 80	# a dynamic service type which will be
+#					# fleshed out with subsequent options.
+#	wccp2_service standard 0 password=foo
+#Default:
+# Use the 'web-cache' standard service.
+
+#  TAG: wccp2_service_info
+#	Dynamic WCCPv2 services require further information to define the
+#	traffic you wish to have diverted.
+#
+#	The format is:
+#
+#	wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>..
+#	    priority=<priority> ports=<port>,<port>..
+#
+#	The relevant WCCPv2 flags:
+#	+ src_ip_hash, dst_ip_hash
+#	+ source_port_hash, dst_port_hash
+#	+ src_ip_alt_hash, dst_ip_alt_hash
+#	+ src_port_alt_hash, dst_port_alt_hash
+#	+ ports_source
+#
+#	The port list can be one to eight entries.
+#
+#	Example:
+#
+#	wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source
+#	    priority=240 ports=80
+#
+#	Note: the service id must have been defined by a previous
+#	'wccp2_service dynamic <id>' entry.
+#Default:
+# none
+
+#  TAG: wccp2_weight
+#	Each cache server gets assigned a set of the destination
+#	hash proportional to their weight.
+#Default:
+# wccp2_weight 10000
+
+#  TAG: wccp_address
+#	Use this option if you require WCCPv2 to use a specific
+#	interface address.
+#
+#	The default behavior is to not bind to any specific address.
+#Default:
+# Address selected by the operating system.
+
+#  TAG: wccp2_address
+#	Use this option if you require WCCP to use a specific
+#	interface address.
+#
+#	The default behavior is to not bind to any specific address.
+#Default:
+# Address selected by the operating system.
+
+# PERSISTENT CONNECTION HANDLING
+# -----------------------------------------------------------------------------
+#
+# Also see "pconn_timeout" in the TIMEOUTS section
+
+#  TAG: client_persistent_connections
+#	Persistent connection support for clients.
+#	Squid uses persistent connections (when allowed). You can use
+#	this option to disable persistent connections with clients.
+#Default:
+# client_persistent_connections on
+
+#  TAG: server_persistent_connections
+#	Persistent connection support for servers.
+#	Squid uses persistent connections (when allowed). You can use
+#	this option to disable persistent connections with servers.
+#Default:
+# server_persistent_connections on
+
+#  TAG: persistent_connection_after_error
+#	With this directive the use of persistent connections after
+#	HTTP errors can be disabled. Useful if you have clients
+#	who fail to handle errors on persistent connections proper.
+#Default:
+# persistent_connection_after_error on
+
+#  TAG: detect_broken_pconn
+#	Some servers have been found to incorrectly signal the use
+#	of HTTP/1.0 persistent connections even on replies not
+#	compatible, causing significant delays. This server problem
+#	has mostly been seen on redirects.
+#
+#	By enabling this directive Squid attempts to detect such
+#	broken replies and automatically assume the reply is finished
+#	after 10 seconds timeout.
+#Default:
+# detect_broken_pconn off
+
+# CACHE DIGEST OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: digest_generation
+#	This controls whether the server will generate a Cache Digest
+#	of its contents.  By default, Cache Digest generation is
+#	enabled if Squid is compiled with --enable-cache-digests defined.
+#Default:
+# digest_generation on
+
+#  TAG: digest_bits_per_entry
+#	This is the number of bits of the server's Cache Digest which
+#	will be associated with the Digest entry for a given HTTP
+#	Method and URL (public key) combination.  The default is 5.
+#Default:
+# digest_bits_per_entry 5
+
+#  TAG: digest_rebuild_period	(seconds)
+#	This is the wait time between Cache Digest rebuilds.
+#Default:
+# digest_rebuild_period 1 hour
+
+#  TAG: digest_rewrite_period	(seconds)
+#	This is the wait time between Cache Digest writes to
+#	disk.
+#Default:
+# digest_rewrite_period 1 hour
+
+#  TAG: digest_swapout_chunk_size	(bytes)
+#	This is the number of bytes of the Cache Digest to write to
+#	disk at a time.  It defaults to 4096 bytes (4KB), the Squid
+#	default swap page.
+#Default:
+# digest_swapout_chunk_size 4096 bytes
+
+#  TAG: digest_rebuild_chunk_percentage	(percent, 0-100)
+#	This is the percentage of the Cache Digest to be scanned at a
+#	time.  By default it is set to 10% of the Cache Digest.
+#Default:
+# digest_rebuild_chunk_percentage 10
+
+# SNMP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: snmp_port
+#	The port number where Squid listens for SNMP requests. To enable
+#	SNMP support set this to a suitable port number. Port number
+#	3401 is often used for the Squid SNMP agent. By default it's
+#	set to "0" (disabled)
+#
+#	Example:
+#		snmp_port 3401
+#Default:
+# SNMP disabled.
+
+#  TAG: snmp_access
+#	Allowing or denying access to the SNMP port.
+#
+#	All access to the agent is denied by default.
+#	usage:
+#
+#	snmp_access allow|deny [!]aclname ...
+#
+#	This clause only supports fast acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#Example:
+# snmp_access allow snmppublic localhost
+# snmp_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: snmp_incoming_address
+#	Just like 'udp_incoming_address', but for the SNMP port.
+#
+#	snmp_incoming_address	is used for the SNMP socket receiving
+#				messages from SNMP agents.
+#
+#	The default snmp_incoming_address is to listen on all
+#	available network interfaces.
+#Default:
+# Accept SNMP packets from all machine interfaces.
+
+#  TAG: snmp_outgoing_address
+#	Just like 'udp_outgoing_address', but for the SNMP port.
+#
+#	snmp_outgoing_address	is used for SNMP packets returned to SNMP
+#				agents.
+#
+#	If snmp_outgoing_address is not set it will use the same socket
+#	as snmp_incoming_address. Only change this if you want to have
+#	SNMP replies sent using another address than where this Squid
+#	listens for SNMP queries.
+#
+#	NOTE, snmp_incoming_address and snmp_outgoing_address can not have
+#	the same value since they both use the same port.
+#Default:
+# Use snmp_incoming_address or an address selected by the operating system.
+
+# ICP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: icp_port
+#	The port number where Squid sends and receives ICP queries to
+#	and from neighbor caches.  The standard UDP port for ICP is 3130.
+#
+#	Example:
+#		icp_port 3130
+#Default:
+# ICP disabled.
+
+#  TAG: htcp_port
+#	The port number where Squid sends and receives HTCP queries to
+#	and from neighbor caches.  To turn it on you want to set it to
+#	4827.
+#
+#	Example:
+#		htcp_port 4827
+#Default:
+# HTCP disabled.
+
+#  TAG: log_icp_queries	on|off
+#	If set, ICP queries are logged to access.log. You may wish
+#	do disable this if your ICP load is VERY high to speed things
+#	up or to simplify log analysis.
+#Default:
+# log_icp_queries on
+
+#  TAG: udp_incoming_address
+#	udp_incoming_address	is used for UDP packets received from other
+#				caches.
+#
+#	The default behavior is to not bind to any specific address.
+#
+#	Only change this if you want to have all UDP queries received on
+#	a specific interface/address.
+#
+#	NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS
+#	modules. Altering it will affect all of them in the same manner.
+#
+#	see also; udp_outgoing_address
+#
+#	NOTE, udp_incoming_address and udp_outgoing_address can not
+#	have the same value since they both use the same port.
+#Default:
+# Accept packets from all machine interfaces.
+
+#  TAG: udp_outgoing_address
+#	udp_outgoing_address	is used for UDP packets sent out to other
+#				caches.
+#
+#	The default behavior is to not bind to any specific address.
+#
+#	Instead it will use the same socket as udp_incoming_address.
+#	Only change this if you want to have UDP queries sent using another
+#	address than where this Squid listens for UDP queries from other
+#	caches.
+#
+#	NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS
+#	modules. Altering it will affect all of them in the same manner.
+#
+#	see also; udp_incoming_address
+#
+#	NOTE, udp_incoming_address and udp_outgoing_address can not
+#	have the same value since they both use the same port.
+#Default:
+# Use udp_incoming_address or an address selected by the operating system.
+
+#  TAG: icp_hit_stale	on|off
+#	If you want to return ICP_HIT for stale cache objects, set this
+#	option to 'on'.  If you have sibling relationships with caches
+#	in other administrative domains, this should be 'off'.  If you only
+#	have sibling relationships with caches under your control,
+#	it is probably okay to set this to 'on'.
+#	If set to 'on', your siblings should use the option "allow-miss"
+#	on their cache_peer lines for connecting to you.
+#Default:
+# icp_hit_stale off
+
+#  TAG: minimum_direct_hops
+#	If using the ICMP pinging stuff, do direct fetches for sites
+#	which are no more than this many hops away.
+#Default:
+# minimum_direct_hops 4
+
+#  TAG: minimum_direct_rtt	(msec)
+#	If using the ICMP pinging stuff, do direct fetches for sites
+#	which are no more than this many rtt milliseconds away.
+#Default:
+# minimum_direct_rtt 400
+
+#  TAG: netdb_low
+#	The low water mark for the ICMP measurement database.
+#
+#	Note: high watermark controlled by netdb_high directive.
+#
+#	These watermarks are counts, not percents.  The defaults are
+#	(low) 900 and (high) 1000.  When the high water mark is
+#	reached, database entries will be deleted until the low
+#	mark is reached.
+#Default:
+# netdb_low 900
+
+#  TAG: netdb_high
+#	The high water mark for the ICMP measurement database.
+#
+#	Note: low watermark controlled by netdb_low directive.
+#
+#	These watermarks are counts, not percents.  The defaults are
+#	(low) 900 and (high) 1000.  When the high water mark is
+#	reached, database entries will be deleted until the low
+#	mark is reached.
+#Default:
+# netdb_high 1000
+
+#  TAG: netdb_ping_period
+#	The minimum period for measuring a site.  There will be at
+#	least this much delay between successive pings to the same
+#	network.  The default is five minutes.
+#Default:
+# netdb_ping_period 5 minutes
+
+#  TAG: query_icmp	on|off
+#	If you want to ask your peers to include ICMP data in their ICP
+#	replies, enable this option.
+#
+#	If your peer has configured Squid (during compilation) with
+#	'--enable-icmp' that peer will send ICMP pings to origin server
+#	sites of the URLs it receives.  If you enable this option the
+#	ICP replies from that peer will include the ICMP data (if available).
+#	Then, when choosing a parent cache, Squid will choose the parent with
+#	the minimal RTT to the origin server.  When this happens, the
+#	hierarchy field of the access.log will be
+#	"CLOSEST_PARENT_MISS".  This option is off by default.
+#Default:
+# query_icmp off
+
+#  TAG: test_reachability	on|off
+#	When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH
+#	instead of ICP_MISS if the target host is NOT in the ICMP
+#	database, or has a zero RTT.
+#Default:
+# test_reachability off
+
+#  TAG: icp_query_timeout	(msec)
+#	Normally Squid will automatically determine an optimal ICP
+#	query timeout value based on the round-trip-time of recent ICP
+#	queries.  If you want to override the value determined by
+#	Squid, set this 'icp_query_timeout' to a non-zero value.  This
+#	value is specified in MILLISECONDS, so, to use a 2-second
+#	timeout (the old default), you would write:
+#
+#		icp_query_timeout 2000
+#Default:
+# Dynamic detection.
+
+#  TAG: maximum_icp_query_timeout	(msec)
+#	Normally the ICP query timeout is determined dynamically.  But
+#	sometimes it can lead to very large values (say 5 seconds).
+#	Use this option to put an upper limit on the dynamic timeout
+#	value.  Do NOT use this option to always use a fixed (instead
+#	of a dynamic) timeout value. To set a fixed timeout see the
+#	'icp_query_timeout' directive.
+#Default:
+# maximum_icp_query_timeout 2000
+
+#  TAG: minimum_icp_query_timeout	(msec)
+#	Normally the ICP query timeout is determined dynamically.  But
+#	sometimes it can lead to very small timeouts, even lower than
+#	the normal latency variance on your link due to traffic.
+#	Use this option to put an lower limit on the dynamic timeout
+#	value.  Do NOT use this option to always use a fixed (instead
+#	of a dynamic) timeout value. To set a fixed timeout see the
+#	'icp_query_timeout' directive.
+#Default:
+# minimum_icp_query_timeout 5
+
+#  TAG: background_ping_rate	time-units
+#	Controls how often the ICP pings are sent to siblings that
+#	have background-ping set.
+#Default:
+# background_ping_rate 10 seconds
+
+# MULTICAST ICP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: mcast_groups
+#	This tag specifies a list of multicast groups which your server
+#	should join to receive multicasted ICP queries.
+#
+#	NOTE!  Be very careful what you put here!  Be sure you
+#	understand the difference between an ICP _query_ and an ICP
+#	_reply_.  This option is to be set only if you want to RECEIVE
+#	multicast queries.  Do NOT set this option to SEND multicast
+#	ICP (use cache_peer for that).  ICP replies are always sent via
+#	unicast, so this option does not affect whether or not you will
+#	receive replies from multicast group members.
+#
+#	You must be very careful to NOT use a multicast address which
+#	is already in use by another group of caches.
+#
+#	If you are unsure about multicast, please read the Multicast
+#	chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/).
+#
+#	Usage: mcast_groups 239.128.16.128 224.0.1.20
+#
+#	By default, Squid doesn't listen on any multicast groups.
+#Default:
+# none
+
+#  TAG: mcast_miss_addr
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	If you enable this option, every "cache miss" URL will
+#	be sent out on the specified multicast address.
+#
+#	Do not enable this option unless you are are absolutely
+#	certain you understand what you are doing.
+#Default:
+# disabled.
+
+#  TAG: mcast_miss_ttl
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	This is the time-to-live value for packets multicasted
+#	when multicasting off cache miss URLs is enabled.  By
+#	default this is set to 'site scope', i.e. 16.
+#Default:
+# mcast_miss_ttl 16
+
+#  TAG: mcast_miss_port
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	This is the port number to be used in conjunction with
+#	'mcast_miss_addr'.
+#Default:
+# mcast_miss_port 3135
+
+#  TAG: mcast_miss_encode_key
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	The URLs that are sent in the multicast miss stream are
+#	encrypted.  This is the encryption key.
+#Default:
+# mcast_miss_encode_key XXXXXXXXXXXXXXXX
+
+#  TAG: mcast_icp_query_timeout	(msec)
+#	For multicast peers, Squid regularly sends out ICP "probes" to
+#	count how many other peers are listening on the given multicast
+#	address.  This value specifies how long Squid should wait to
+#	count all the replies.  The default is 2000 msec, or 2
+#	seconds.
+#Default:
+# mcast_icp_query_timeout 2000
+
+# INTERNAL ICON OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: icon_directory
+#	Where the icons are stored. These are normally kept in
+#	/usr/share/squid/icons
+#Default:
+# icon_directory /usr/share/squid/icons
+
+#  TAG: global_internal_static
+#	This directive controls is Squid should intercept all requests for
+#	/squid-internal-static/ no matter which host the URL is requesting
+#	(default on setting), or if nothing special should be done for
+#	such URLs (off setting). The purpose of this directive is to make
+#	icons etc work better in complex cache hierarchies where it may
+#	not always be possible for all corners in the cache mesh to reach
+#	the server generating a directory listing.
+#Default:
+# global_internal_static on
+
+#  TAG: short_icon_urls
+#	If this is enabled Squid will use short URLs for icons.
+#	If disabled it will revert to the old behavior of including
+#	it's own name and port in the URL.
+#
+#	If you run a complex cache hierarchy with a mix of Squid and
+#	other proxies you may need to disable this directive.
+#Default:
+# short_icon_urls on
+
+# ERROR PAGE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: error_directory
+#	If you wish to create your own versions of the default
+#	error files to customize them to suit your company copy
+#	the error/template files to another directory and point
+#	this tag at them.
+#
+#	WARNING: This option will disable multi-language support
+#	         on error pages if used.
+#
+#	The squid developers are interested in making squid available in
+#	a wide variety of languages. If you are making translations for a
+#	language that Squid does not currently provide please consider
+#	contributing your translation back to the project.
+#	http://wiki.squid-cache.org/Translations
+#
+#	The squid developers working on translations are happy to supply drop-in
+#	translated error files in exchange for any new language contributions.
+#Default:
+# Send error pages in the clients preferred language
+
+#  TAG: error_default_language
+#	Set the default language which squid will send error pages in
+#	if no existing translation matches the clients language
+#	preferences.
+#
+#	If unset (default) generic English will be used.
+#
+#	The squid developers are interested in making squid available in
+#	a wide variety of languages. If you are interested in making
+#	translations for any language see the squid wiki for details.
+#	http://wiki.squid-cache.org/Translations
+#Default:
+# Generate English language pages.
+
+#  TAG: error_log_languages
+#	Log to cache.log what languages users are attempting to
+#	auto-negotiate for translations.
+#
+#	Successful negotiations are not logged. Only failures
+#	have meaning to indicate that Squid may need an upgrade
+#	of its error page translations.
+#Default:
+# error_log_languages on
+
+#  TAG: err_page_stylesheet
+#	CSS Stylesheet to pattern the display of Squid default error pages.
+#
+#	For information on CSS see http://www.w3.org/Style/CSS/
+#Default:
+# err_page_stylesheet /etc/squid/errorpage.css
+
+#  TAG: err_html_text
+#	HTML text to include in error messages.  Make this a "mailto"
+#	URL to your admin address, or maybe just a link to your
+#	organizations Web page.
+#
+#	To include this in your error messages, you must rewrite
+#	the error template files (found in the "errors" directory).
+#	Wherever you want the 'err_html_text' line to appear,
+#	insert a %L tag in the error template file.
+#Default:
+# none
+
+#  TAG: email_err_data	on|off
+#	If enabled, information about the occurred error will be
+#	included in the mailto links of the ERR pages (if %W is set)
+#	so that the email body contains the data.
+#	Syntax is <A HREF="mailto:%w%W">%w</A>
+#Default:
+# email_err_data on
+
+#  TAG: deny_info
+#	Usage:   deny_info err_page_name acl
+#	or       deny_info http://... acl
+#	or       deny_info TCP_RESET acl
+#
+#	This can be used to return a ERR_ page for requests which
+#	do not pass the 'http_access' rules.  Squid remembers the last
+#	acl it evaluated in http_access, and if a 'deny_info' line exists
+#	for that ACL Squid returns a corresponding error page.
+#
+#	The acl is typically the last acl on the http_access deny line which
+#	denied access. The exceptions to this rule are:
+#	- When Squid needs to request authentication credentials. It's then
+#	  the first authentication related acl encountered
+#	- When none of the http_access lines matches. It's then the last
+#	  acl processed on the last http_access line.
+#	- When the decision to deny access was made by an adaptation service,
+#	  the acl name is the corresponding eCAP or ICAP service_name.
+#
+#	NP: If providing your own custom error pages with error_directory
+#	    you may also specify them by your custom file name:
+#	    Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys
+#
+#	By defaut Squid will send "403 Forbidden". A different 4xx or 5xx
+#	may be specified by prefixing the file name with the code and a colon.
+#	e.g. 404:ERR_CUSTOM_ACCESS_DENIED
+#
+#	Alternatively you can tell Squid to reset the TCP connection
+#	by specifying TCP_RESET.
+#
+#	Or you can specify an error URL or URL pattern. The browsers will
+#	get redirected to the specified URL after formatting tags have
+#	been replaced. Redirect will be done with 302 or 307 according to
+#	HTTP/1.1 specs. A different 3xx code may be specified by prefixing
+#	the URL. e.g. 303:http://example.com/
+#
+#	URL FORMAT TAGS:
+#		%a	- username (if available. Password NOT included)
+#		%B	- FTP path URL
+#		%e	- Error number
+#		%E	- Error description
+#		%h	- Squid hostname
+#		%H	- Request domain name
+#		%i	- Client IP Address
+#		%M	- Request Method
+#		%o	- Message result from external ACL helper
+#		%p	- Request Port number
+#		%P	- Request Protocol name
+#		%R	- Request URL path
+#		%T	- Timestamp in RFC 1123 format
+#		%U	- Full canonical URL from client
+#			  (HTTPS URLs terminate with *)
+#		%u	- Full canonical URL from client
+#		%w	- Admin email from squid.conf
+#		%x	- Error name
+#		%%	- Literal percent (%) code
+#
+#Default:
+# none
+
+# OPTIONS INFLUENCING REQUEST FORWARDING
+# -----------------------------------------------------------------------------
+
+#  TAG: nonhierarchical_direct
+#	By default, Squid will send any non-hierarchical requests
+#	(not cacheable request type) direct to origin servers.
+#
+#	When this is set to "off", Squid will prefer to send these
+#	requests to parents.
+#
+#	Note that in most configurations, by turning this off you will only
+#	add latency to these request without any improvement in global hit
+#	ratio.
+#
+#	This option only sets a preference. If the parent is unavailable a
+#	direct connection to the origin server may still be attempted. To
+#	completely prevent direct connections use never_direct.
+#Default:
+# nonhierarchical_direct on
+
+#  TAG: prefer_direct
+#	Normally Squid tries to use parents for most requests. If you for some
+#	reason like it to first try going direct and only use a parent if
+#	going direct fails set this to on.
+#
+#	By combining nonhierarchical_direct off and prefer_direct on you
+#	can set up Squid to use a parent as a backup path if going direct
+#	fails.
+#
+#	Note: If you want Squid to use parents for all requests see
+#	the never_direct directive. prefer_direct only modifies how Squid
+#	acts on cacheable requests.
+#Default:
+# prefer_direct off
+
+#  TAG: cache_miss_revalidate	on|off
+#	RFC 7232 defines a conditional request mechanism to prevent
+#	response objects being unnecessarily transferred over the network.
+#	If that mechanism is used by the client and a cache MISS occurs
+#	it can prevent new cache entries being created.
+#
+#	This option determines whether Squid on cache MISS will pass the
+#	client revalidation request to the server or tries to fetch new
+#	content for caching. It can be useful while the cache is mostly
+#	empty to more quickly have the cache populated by generating
+#	non-conditional GETs.
+#
+#	When set to 'on' (default), Squid will pass all client If-* headers
+#	to the server. This permits server responses without a cacheable
+#	payload to be delivered and on MISS no new cache entry is created.
+#
+#	When set to 'off' and if the request is cacheable, Squid will
+#	remove the clients If-Modified-Since and If-None-Match headers from
+#	the request sent to the server. This requests a 200 status response
+#	from the server to create a new cache entry with.
+#Default:
+# cache_miss_revalidate on
+
+#  TAG: always_direct
+#	Usage: always_direct allow|deny [!]aclname ...
+#
+#	Here you can use ACL elements to specify requests which should
+#	ALWAYS be forwarded by Squid to the origin servers without using
+#	any peers.  For example, to always directly forward requests for
+#	local servers ignoring any parents or siblings you may have use
+#	something like:
+#
+#		acl local-servers dstdomain my.domain.net
+#		always_direct allow local-servers
+#
+#	To always forward FTP requests directly, use
+#
+#		acl FTP proto FTP
+#		always_direct allow FTP
+#
+#	NOTE: There is a similar, but opposite option named
+#	'never_direct'.  You need to be aware that "always_direct deny
+#	foo" is NOT the same thing as "never_direct allow foo".  You
+#	may need to use a deny rule to exclude a more-specific case of
+#	some other rule.  Example:
+#
+#		acl local-external dstdomain external.foo.net
+#		acl local-servers dstdomain  .foo.net
+#		always_direct deny local-external
+#		always_direct allow local-servers
+#
+#	NOTE: If your goal is to make the client forward the request
+#	directly to the origin server bypassing Squid then this needs
+#	to be done in the client configuration. Squid configuration
+#	can only tell Squid how Squid should fetch the object.
+#
+#	NOTE: This directive is not related to caching. The replies
+#	is cached as usual even if you use always_direct. To not cache
+#	the replies see the 'cache' directive.
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Prevent any cache_peer being used for this request.
+
+#  TAG: never_direct
+#	Usage: never_direct allow|deny [!]aclname ...
+#
+#	never_direct is the opposite of always_direct.  Please read
+#	the description for always_direct if you have not already.
+#
+#	With 'never_direct' you can use ACL elements to specify
+#	requests which should NEVER be forwarded directly to origin
+#	servers.  For example, to force the use of a proxy for all
+#	requests, except those in your local domain use something like:
+#
+#		acl local-servers dstdomain .foo.net
+#		never_direct deny local-servers
+#		never_direct allow all
+#
+#	or if Squid is inside a firewall and there are local intranet
+#	servers inside the firewall use something like:
+#
+#		acl local-intranet dstdomain .foo.net
+#		acl local-external dstdomain external.foo.net
+#		always_direct deny local-external
+#		always_direct allow local-intranet
+#		never_direct allow all
+#
+#	This clause supports both fast and slow acl types.
+#	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow DNS results to be used for this request.
+
+# ADVANCED NETWORKING OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: incoming_udp_average
+#	Heavy voodoo here.  I can't even believe you are reading this.
+#	Are you crazy?  Don't even think about adjusting these unless
+#	you understand the algorithms in comm_select.c first!
+#Default:
+# incoming_udp_average 6
+
+#  TAG: incoming_tcp_average
+#	Heavy voodoo here.  I can't even believe you are reading this.
+#	Are you crazy?  Don't even think about adjusting these unless
+#	you understand the algorithms in comm_select.c first!
+#Default:
+# incoming_tcp_average 4
+
+#  TAG: incoming_dns_average
+#	Heavy voodoo here.  I can't even believe you are reading this.
+#	Are you crazy?  Don't even think about adjusting these unless
+#	you understand the algorithms in comm_select.c first!
+#Default:
+# incoming_dns_average 4
+
+#  TAG: min_udp_poll_cnt
+#	Heavy voodoo here.  I can't even believe you are reading this.
+#	Are you crazy?  Don't even think about adjusting these unless
+#	you understand the algorithms in comm_select.c first!
+#Default:
+# min_udp_poll_cnt 8
+
+#  TAG: min_dns_poll_cnt
+#	Heavy voodoo here.  I can't even believe you are reading this.
+#	Are you crazy?  Don't even think about adjusting these unless
+#	you understand the algorithms in comm_select.c first!
+#Default:
+# min_dns_poll_cnt 8
+
+#  TAG: min_tcp_poll_cnt
+#	Heavy voodoo here.  I can't even believe you are reading this.
+#	Are you crazy?  Don't even think about adjusting these unless
+#	you understand the algorithms in comm_select.c first!
+#Default:
+# min_tcp_poll_cnt 8
+
+#  TAG: accept_filter
+#	FreeBSD:
+#
+#	The name of an accept(2) filter to install on Squid's
+#	listen socket(s).  This feature is perhaps specific to
+#	FreeBSD and requires support in the kernel.
+#
+#	The 'httpready' filter delays delivering new connections
+#	to Squid until a full HTTP request has been received.
+#	See the accf_http(9) man page for details.
+#
+#	The 'dataready' filter delays delivering new connections
+#	to Squid until there is some data to process.
+#	See the accf_dataready(9) man page for details.
+#
+#	Linux:
+#
+#	The 'data' filter delays delivering of new connections
+#	to Squid until there is some data to process by TCP_ACCEPT_DEFER.
+#	You may optionally specify a number of seconds to wait by
+#	'data=N' where N is the number of seconds. Defaults to 30
+#	if not specified.  See the tcp(7) man page for details.
+#EXAMPLE:
+## FreeBSD
+#accept_filter httpready
+## Linux
+#accept_filter data
+#Default:
+# none
+
+#  TAG: client_ip_max_connections
+#	Set an absolute limit on the number of connections a single
+#	client IP can use. Any more than this and Squid will begin to drop
+#	new connections from the client until it closes some links.
+#
+#	Note that this is a global limit. It affects all HTTP, HTCP, Gopher and FTP
+#	connections from the client. For finer control use the ACL access controls.
+#
+#	Requires client_db to be enabled (the default).
+#
+#	WARNING: This may noticably slow down traffic received via external proxies
+#	or NAT devices and cause them to rebound error messages back to their clients.
+#Default:
+# No limit.
+
+#  TAG: tcp_recv_bufsize	(bytes)
+#	Size of receive buffer to set for TCP sockets.  Probably just
+#	as easy to change your kernel's default.
+#	Omit from squid.conf to use the default buffer size.
+#Default:
+# Use operating system TCP defaults.
+
+# ICAP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: icap_enable	on|off
+#	If you want to enable the ICAP module support, set this to on.
+#Default:
+# icap_enable off
+
+#  TAG: icap_connect_timeout
+#	This parameter specifies how long to wait for the TCP connect to
+#	the requested ICAP server to complete before giving up and either
+#	terminating the HTTP transaction or bypassing the failure.
+#
+#	The default for optional services is peer_connect_timeout.
+#	The default for essential services is connect_timeout.
+#	If this option is explicitly set, its value applies to all services.
+#Default:
+# none
+
+#  TAG: icap_io_timeout	time-units
+#	This parameter specifies how long to wait for an I/O activity on
+#	an established, active ICAP connection before giving up and
+#	either terminating the HTTP transaction or bypassing the
+#	failure.
+#Default:
+# Use read_timeout.
+
+#  TAG: icap_service_failure_limit	limit [in memory-depth time-units]
+#	The limit specifies the number of failures that Squid tolerates
+#	when establishing a new TCP connection with an ICAP service. If
+#	the number of failures exceeds the limit, the ICAP service is
+#	not used for new ICAP requests until it is time to refresh its
+#	OPTIONS.
+#
+#	A negative value disables the limit. Without the limit, an ICAP
+#	service will not be considered down due to connectivity failures
+#	between ICAP OPTIONS requests.
+#
+#	Squid forgets ICAP service failures older than the specified
+#	value of memory-depth. The memory fading algorithm
+#	is approximate because Squid does not remember individual
+#	errors but groups them instead, splitting the option
+#	value into ten time slots of equal length.
+#
+#	When memory-depth is 0 and by default this option has no
+#	effect on service failure expiration.
+#
+#	Squid always forgets failures when updating service settings
+#	using an ICAP OPTIONS transaction, regardless of this option
+#	setting.
+#
+#	For example,
+#		# suspend service usage after 10 failures in 5 seconds:
+#		icap_service_failure_limit 10 in 5 seconds
+#Default:
+# icap_service_failure_limit 10
+
+#  TAG: icap_service_revival_delay
+#	The delay specifies the number of seconds to wait after an ICAP
+#	OPTIONS request failure before requesting the options again. The
+#	failed ICAP service is considered "down" until fresh OPTIONS are
+#	fetched.
+#
+#	The actual delay cannot be smaller than the hardcoded minimum
+#	delay of 30 seconds.
+#Default:
+# icap_service_revival_delay 180
+
+#  TAG: icap_preview_enable	on|off
+#	The ICAP Preview feature allows the ICAP server to handle the
+#	HTTP message by looking only at the beginning of the message body
+#	or even without receiving the body at all. In some environments,
+#	previews greatly speedup ICAP processing.
+#
+#	During an ICAP OPTIONS transaction, the server may tell	Squid what
+#	HTTP messages should be previewed and how big the preview should be.
+#	Squid will not use Preview if the server did not request one.
+#
+#	To disable ICAP Preview for all ICAP services, regardless of
+#	individual ICAP server OPTIONS responses, set this option to "off".
+#Example:
+#icap_preview_enable off
+#Default:
+# icap_preview_enable on
+
+#  TAG: icap_preview_size
+#	The default size of preview data to be sent to the ICAP server.
+#	This value might be overwritten on a per server basis by OPTIONS requests.
+#Default:
+# No preview sent.
+
+#  TAG: icap_206_enable	on|off
+#	206 (Partial Content) responses is an ICAP extension that allows the
+#	ICAP agents to optionally combine adapted and original HTTP message
+#	content. The decision to combine is postponed until the end of the
+#	ICAP response. Squid supports Partial Content extension by default.
+#
+#	Activation of the Partial Content extension is negotiated with each
+#	ICAP service during OPTIONS exchange. Most ICAP servers should handle
+#	negotation correctly even if they do not support the extension, but
+#	some might fail. To disable Partial Content support for all ICAP
+#	services and to avoid any negotiation, set this option to "off".
+#
+#	Example:
+#	    icap_206_enable off
+#Default:
+# icap_206_enable on
+
+#  TAG: icap_default_options_ttl
+#	The default TTL value for ICAP OPTIONS responses that don't have
+#	an Options-TTL header.
+#Default:
+# icap_default_options_ttl 60
+
+#  TAG: icap_persistent_connections	on|off
+#	Whether or not Squid should use persistent connections to
+#	an ICAP server.
+#Default:
+# icap_persistent_connections on
+
+#  TAG: adaptation_send_client_ip	on|off
+#	If enabled, Squid shares HTTP client IP information with adaptation
+#	services. For ICAP, Squid adds the X-Client-IP header to ICAP requests.
+#	For eCAP, Squid sets the libecap::metaClientIp transaction option.
+#
+#	See also: adaptation_uses_indirect_client
+#Default:
+# adaptation_send_client_ip off
+
+#  TAG: adaptation_send_username	on|off
+#	This sends authenticated HTTP client username (if available) to
+#	the adaptation service.
+#
+#	For ICAP, the username value is encoded based on the
+#	icap_client_username_encode option and is sent using the header
+#	specified by the icap_client_username_header option.
+#Default:
+# adaptation_send_username off
+
+#  TAG: icap_client_username_header
+#	ICAP request header name to use for adaptation_send_username.
+#Default:
+# icap_client_username_header X-Client-Username
+
+#  TAG: icap_client_username_encode	on|off
+#	Whether to base64 encode the authenticated client username.
+#Default:
+# icap_client_username_encode off
+
+#  TAG: icap_service
+#	Defines a single ICAP service using the following format:
+#
+#	icap_service id vectoring_point uri [option ...]
+#
+#	id: ID
+#		an opaque identifier or name which is used to direct traffic to
+#		this specific service. Must be unique among all adaptation
+#		services in squid.conf.
+#
+#	vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
+#		This specifies at which point of transaction processing the
+#		ICAP service should be activated. *_postcache vectoring points
+#		are not yet supported.
+#
+#	uri: icap://servername:port/servicepath
+#		ICAP server and service location.
+#
+#	ICAP does not allow a single service to handle both REQMOD and RESPMOD
+#	transactions. Squid does not enforce that requirement. You can specify
+#	services with the same service_url and different vectoring_points. You
+#	can even specify multiple identical services as long as their
+#	service_names differ.
+#
+#	To activate a service, use the adaptation_access directive. To group
+#	services, use adaptation_service_chain and adaptation_service_set.
+#
+#	Service options are separated by white space. ICAP services support
+#	the following name=value options:
+#
+#	bypass=on|off|1|0
+#		If set to 'on' or '1', the ICAP service is treated as
+#		optional. If the service cannot be reached or malfunctions,
+#		Squid will try to ignore any errors and process the message as
+#		if the service was not enabled. No all ICAP errors can be
+#		bypassed.  If set to 0, the ICAP service is treated as
+#		essential and all ICAP errors will result in an error page
+#		returned to the HTTP client.
+#
+#		Bypass is off by default: services are treated as essential.
+#
+#	routing=on|off|1|0
+#		If set to 'on' or '1', the ICAP service is allowed to
+#		dynamically change the current message adaptation plan by
+#		returning a chain of services to be used next. The services
+#		are specified using the X-Next-Services ICAP response header
+#		value, formatted as a comma-separated list of service names.
+#		Each named service should be configured in squid.conf. Other
+#		services are ignored. An empty X-Next-Services value results
+#		in an empty plan which ends the current adaptation.
+#
+#		Dynamic adaptation plan may cross or cover multiple supported
+#		vectoring points in their natural processing order.
+#
+#		Routing is not allowed by default: the ICAP X-Next-Services
+#		response header is ignored.
+#
+#	ipv6=on|off
+#		Only has effect on split-stack systems. The default on those systems
+#		is to use IPv4-only connections. When set to 'on' this option will
+#		make Squid use IPv6-only connections to contact this ICAP service.
+#
+#	on-overload=block|bypass|wait|force
+#		If the service Max-Connections limit has been reached, do
+#		one of the following for each new ICAP transaction:
+#		  * block:  send an HTTP error response to the client
+#		  * bypass: ignore the "over-connected" ICAP service
+#		  * wait:   wait (in a FIFO queue) for an ICAP connection slot
+#		  * force:  proceed, ignoring the Max-Connections limit
+#
+#		In SMP mode with N workers, each worker assumes the service
+#		connection limit is Max-Connections/N, even though not all
+#		workers may use a given service.
+#
+#		The default value is "bypass" if service is bypassable,
+#		otherwise it is set to "wait".
+#
+#
+#	max-conn=number
+#		Use the given number as the Max-Connections limit, regardless
+#		of the Max-Connections value given by the service, if any.
+#
+#	Older icap_service format without optional named parameters is
+#	deprecated but supported for backward compatibility.
+#
+#Example:
+#icap_service svcBlocker reqmod_precache icap://icap1.mydomain.net:1344/reqmod bypass=0
+#icap_service svcLogger reqmod_precache icap://icap2.mydomain.net:1344/respmod routing=on
+#Default:
+# none
+
+#  TAG: icap_class
+#	This deprecated option was documented to define an ICAP service
+#	chain, even though it actually defined a set of similar, redundant
+#	services, and the chains were not supported.
+#
+#	To define a set of redundant services, please use the
+#	adaptation_service_set directive. For service chains, use
+#	adaptation_service_chain.
+#Default:
+# none
+
+#  TAG: icap_access
+#	This option is deprecated. Please use adaptation_access, which
+#	has the same ICAP functionality, but comes with better
+#	documentation, and eCAP support.
+#Default:
+# none
+
+# eCAP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: ecap_enable	on|off
+#	Controls whether eCAP support is enabled.
+#Default:
+# ecap_enable off
+
+#  TAG: ecap_service
+#	Defines a single eCAP service
+#
+#	ecap_service id vectoring_point uri [option ...]
+#
+#        id: ID
+#		an opaque identifier or name which is used to direct traffic to
+#		this specific service. Must be unique among all adaptation
+#		services in squid.conf.
+#
+#	vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
+#		This specifies at which point of transaction processing the
+#		eCAP service should be activated. *_postcache vectoring points
+#		are not yet supported.
+#
+#	uri: ecap://vendor/service_name?custom&cgi=style&parameters=optional
+#		Squid uses the eCAP service URI to match this configuration
+#		line with one of the dynamically loaded services. Each loaded
+#		eCAP service must have a unique URI. Obtain the right URI from
+#		the service provider.
+#
+#	To activate a service, use the adaptation_access directive. To group
+#	services, use adaptation_service_chain and adaptation_service_set.
+#
+#	Service options are separated by white space. eCAP services support
+#	the following name=value options:
+#
+#	bypass=on|off|1|0
+#		If set to 'on' or '1', the eCAP service is treated as optional.
+#		If the service cannot be reached or malfunctions, Squid will try
+#		to ignore any errors and process the message as if the service
+#		was not enabled. No all eCAP errors can be bypassed.
+#		If set to 'off' or '0', the eCAP service is treated as essential
+#		and all eCAP errors will result in an error page returned to the
+#		HTTP client.
+#
+#                Bypass is off by default: services are treated as essential.
+#
+#	routing=on|off|1|0
+#		If set to 'on' or '1', the eCAP service is allowed to
+#		dynamically change the current message adaptation plan by
+#		returning a chain of services to be used next.
+#
+#		Dynamic adaptation plan may cross or cover multiple supported
+#		vectoring points in their natural processing order.
+#
+#		Routing is not allowed by default.
+#
+#	Older ecap_service format without optional named parameters is
+#	deprecated but supported for backward compatibility.
+#
+#
+#Example:
+#ecap_service s1 reqmod_precache ecap://filters.R.us/leakDetector?on_error=block bypass=off
+#ecap_service s2 respmod_precache ecap://filters.R.us/virusFilter config=/etc/vf.cfg bypass=on
+#Default:
+# none
+
+#  TAG: loadable_modules
+#	Instructs Squid to load the specified dynamic module(s) or activate
+#	preloaded module(s).
+#Example:
+#loadable_modules /usr/lib/MinimalAdapter.so
+#Default:
+# none
+
+# MESSAGE ADAPTATION OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: adaptation_service_set
+#
+#	Configures an ordered set of similar, redundant services. This is
+#	useful when hot standby or backup adaptation servers are available.
+#
+#	    adaptation_service_set set_name service_name1 service_name2 ...
+#
+# 	The named services are used in the set declaration order. The first
+#	applicable adaptation service from the set is used first. The next
+#	applicable service is tried if and only if the transaction with the
+#	previous service fails and the message waiting to be adapted is still
+#	intact.
+#
+#	When adaptation starts, broken services are ignored as if they were
+#	not a part of the set. A broken service is a down optional service.
+#
+#	The services in a set must be attached to the same vectoring point
+#	(e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).
+#
+#	If all services in a set are optional then adaptation failures are
+#	bypassable. If all services in the set are essential, then a
+#	transaction failure with one service may still be retried using
+#	another service from the set, but when all services fail, the master
+#	transaction fails as well.
+#
+#	A set may contain a mix of optional and essential services, but that
+#	is likely to lead to surprising results because broken services become
+#	ignored (see above), making previously bypassable failures fatal.
+#	Technically, it is the bypassability of the last failed service that
+#	matters.
+#
+#	See also: adaptation_access adaptation_service_chain
+#
+#Example:
+#adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup
+#adaptation service_set svcLogger loggerLocal loggerRemote
+#Default:
+# none
+
+#  TAG: adaptation_service_chain
+#
+#	Configures a list of complementary services that will be applied
+#	one-by-one, forming an adaptation chain or pipeline. This is useful
+#	when Squid must perform different adaptations on the same message.
+#
+#	    adaptation_service_chain chain_name service_name1 svc_name2 ...
+#
+# 	The named services are used in the chain declaration order. The first
+#	applicable adaptation service from the chain is used first. The next
+#	applicable service is applied to the successful adaptation results of
+#	the previous service in the chain.
+#
+#	When adaptation starts, broken services are ignored as if they were
+#	not a part of the chain. A broken service is a down optional service.
+#
+#	Request satisfaction terminates the adaptation chain because Squid
+#	does not currently allow declaration of RESPMOD services at the
+#	"reqmod_precache" vectoring point (see icap_service or ecap_service).
+#
+#	The services in a chain must be attached to the same vectoring point
+#	(e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).
+#
+#	A chain may contain a mix of optional and essential services. If an
+#	essential adaptation fails (or the failure cannot be bypassed for
+#	other reasons), the master transaction fails. Otherwise, the failure
+#	is bypassed as if the failed adaptation service was not in the chain.
+#
+#	See also: adaptation_access adaptation_service_set
+#
+#Example:
+#adaptation_service_chain svcRequest requestLogger urlFilter leakDetector
+#Default:
+# none
+
+#  TAG: adaptation_access
+#	Sends an HTTP transaction to an ICAP or eCAP adaptation	service.
+#
+#	adaptation_access service_name allow|deny [!]aclname...
+#	adaptation_access set_name     allow|deny [!]aclname...
+#
+#	At each supported vectoring point, the adaptation_access
+#	statements are processed in the order they appear in this
+#	configuration file. Statements pointing to the following services
+#	are ignored (i.e., skipped without checking their ACL):
+#
+#	    - services serving different vectoring points
+#	    - "broken-but-bypassable" services
+#	    - "up" services configured to ignore such transactions
+#              (e.g., based on the ICAP Transfer-Ignore header).
+#
+#        When a set_name is used, all services in the set are checked
+#	using the same rules, to find the first applicable one. See
+#	adaptation_service_set for details.
+#
+#	If an access list is checked and there is a match, the
+#	processing stops: For an "allow" rule, the corresponding
+#	adaptation service is used for the transaction. For a "deny"
+#	rule, no adaptation service is activated.
+#
+#	It is currently not possible to apply more than one adaptation
+#	service at the same vectoring point to the same HTTP transaction.
+#
+#        See also: icap_service and ecap_service
+#
+#Example:
+#adaptation_access service_1 allow all
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: adaptation_service_iteration_limit
+#	Limits the number of iterations allowed when applying adaptation
+#	services to a message. If your longest adaptation set or chain
+#	may have more than 16 services, increase the limit beyond its
+#	default value of 16. If detecting infinite iteration loops sooner
+#	is critical, make the iteration limit match the actual number
+#	of services in your longest adaptation set or chain.
+#
+#	Infinite adaptation loops are most likely with routing services.
+#
+#	See also: icap_service routing=1
+#Default:
+# adaptation_service_iteration_limit 16
+
+#  TAG: adaptation_masterx_shared_names
+#	For each master transaction (i.e., the HTTP request and response
+#	sequence, including all related ICAP and eCAP exchanges), Squid
+#	maintains a table of metadata. The table entries are (name, value)
+#	pairs shared among eCAP and ICAP exchanges. The table is destroyed
+#	with the master transaction.
+#
+#	This option specifies the table entry names that Squid must accept
+#	from and forward to the adaptation transactions.
+#
+#	An ICAP REQMOD or RESPMOD transaction may set an entry in the
+#	shared table by returning an ICAP header field with a name
+#	specified in adaptation_masterx_shared_names.
+#
+#	An eCAP REQMOD or RESPMOD transaction may set an entry in the
+#	shared table by implementing the libecap::visitEachOption() API
+#	to provide an option with a name specified in
+#	adaptation_masterx_shared_names.
+#
+#	Squid will store and forward the set entry to subsequent adaptation
+#	transactions within the same master transaction scope.
+#
+#	Only one shared entry name is supported at this time.
+#
+#Example:
+## share authentication information among ICAP services
+#adaptation_masterx_shared_names X-Subscriber-ID
+#Default:
+# none
+
+#  TAG: adaptation_meta
+#	This option allows Squid administrator to add custom ICAP request
+#	headers or eCAP options to Squid ICAP requests or eCAP transactions.
+#	Use it to pass custom authentication tokens and other
+#	transaction-state related meta information to an ICAP/eCAP service.
+#
+#	The addition of a meta header is ACL-driven:
+#		adaptation_meta name value [!]aclname ...
+#
+#	Processing for a given header name stops after the first ACL list match.
+#	Thus, it is impossible to add two headers with the same name. If no ACL
+#	lists match for a given header name, no such header is added. For
+#	example:
+#
+#		# do not debug transactions except for those that need debugging
+#		adaptation_meta X-Debug 1 needs_debugging
+#
+#		# log all transactions except for those that must remain secret
+#		adaptation_meta X-Log 1 !keep_secret
+#
+#		# mark transactions from users in the "G 1" group
+#		adaptation_meta X-Authenticated-Groups "G 1" authed_as_G1
+#
+#	The "value" parameter may be a regular squid.conf token or a "double
+#	quoted string". Within the quoted string, use backslash (\) to escape
+#	any character, which is currently only useful for escaping backslashes
+#	and double quotes. For example,
+#	    "this string has one backslash (\\) and two \"quotes\""
+#
+#	Used adaptation_meta header values may be logged via %note
+#	logformat code. If multiple adaptation_meta headers with the same name
+#	are used during master transaction lifetime, the header values are
+#	logged in the order they were used and duplicate values are ignored
+#	(only the first repeated value will be logged).
+#Default:
+# none
+
+#  TAG: icap_retry
+#	This ACL determines which retriable ICAP transactions are
+#	retried. Transactions that received a complete ICAP response
+#	and did not have to consume or produce HTTP bodies to receive
+#	that response are usually retriable.
+#
+#	icap_retry allow|deny [!]aclname ...
+#
+#	Squid automatically retries some ICAP I/O timeouts and errors
+#	due to persistent connection race conditions.
+#
+#	See also: icap_retry_limit
+#Default:
+# icap_retry deny all
+
+#  TAG: icap_retry_limit
+#	Limits the number of retries allowed.
+#
+#	Communication errors due to persistent connection race
+#	conditions are unavoidable, automatically retried, and do not
+#	count against this limit.
+#
+#	See also: icap_retry
+#Default:
+# No retries are allowed.
+
+# DNS OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: check_hostnames
+#	For security and stability reasons Squid can check
+#	hostnames for Internet standard RFC compliance. If you want
+#	Squid to perform these checks turn this directive on.
+#Default:
+# check_hostnames off
+
+#  TAG: allow_underscore
+#	Underscore characters is not strictly allowed in Internet hostnames
+#	but nevertheless used by many sites. Set this to off if you want
+#	Squid to be strict about the standard.
+#	This check is performed only when check_hostnames is set to on.
+#Default:
+# allow_underscore on
+
+#  TAG: dns_retransmit_interval
+#	Initial retransmit interval for DNS queries. The interval is
+#	doubled each time all configured DNS servers have been tried.
+#Default:
+# dns_retransmit_interval 5 seconds
+
+#  TAG: dns_timeout
+#	DNS Query timeout. If no response is received to a DNS query
+#	within this time all DNS servers for the queried domain
+#	are assumed to be unavailable.
+#Default:
+# dns_timeout 30 seconds
+
+#  TAG: dns_packet_max
+#	Maximum number of bytes packet size to advertise via EDNS.
+#	Set to "none" to disable EDNS large packet support.
+#
+#	For legacy reasons DNS UDP replies will default to 512 bytes which
+#	is too small for many responses. EDNS provides a means for Squid to
+#	negotiate receiving larger responses back immediately without having
+#	to failover with repeat requests. Responses larger than this limit
+#	will retain the old behaviour of failover to TCP DNS.
+#
+#	Squid has no real fixed limit internally, but allowing packet sizes
+#	over 1500 bytes requires network jumbogram support and is usually not
+#	necessary.
+#
+#	WARNING: The RFC also indicates that some older resolvers will reply
+#	with failure of the whole request if the extension is added. Some
+#	resolvers have already been identified which will reply with mangled
+#	EDNS response on occasion. Usually in response to many-KB jumbogram
+#	sizes being advertised by Squid.
+#	Squid will currently treat these both as an unable-to-resolve domain
+#	even if it would be resolvable without EDNS.
+#Default:
+# EDNS disabled
+
+#  TAG: dns_defnames	on|off
+#	Normally the RES_DEFNAMES resolver option is disabled
+#	(see res_init(3)).  This prevents caches in a hierarchy
+#	from interpreting single-component hostnames locally.  To allow
+#	Squid to handle single-component names, enable this option.
+#Default:
+# Search for single-label domain names is disabled.
+
+#  TAG: dns_multicast_local	on|off
+#	When set to on, Squid sends multicast DNS lookups on the local
+#	network for domains ending in .local and .arpa.
+#	This enables local servers and devices to be contacted in an
+#	ad-hoc or zero-configuration network environment.
+#Default:
+# Search for .local and .arpa names is disabled.
+
+#  TAG: dns_nameservers
+#	Use this if you want to specify a list of DNS name servers
+#	(IP addresses) to use instead of those given in your
+#	/etc/resolv.conf file.
+#
+#	On Windows platforms, if no value is specified here or in
+#	the /etc/resolv.conf file, the list of DNS name servers are
+#	taken from the Windows registry, both static and dynamic DHCP
+#	configurations are supported.
+#
+#	Example: dns_nameservers 10.0.0.1 192.172.0.4
+#Default:
+# Use operating system definitions
+
+#  TAG: hosts_file
+#	Location of the host-local IP name-address associations
+#	database. Most Operating Systems have such a file on different
+#	default locations:
+#	- Un*X & Linux:    /etc/hosts
+#	- Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts
+#			   (%SystemRoot% value install default is c:\winnt)
+#	- Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts
+#			   (%SystemRoot% value install default is c:\windows)
+#	- Windows 9x/Me:   %windir%\hosts
+#			   (%windir% value is usually c:\windows)
+#	- Cygwin:	   /etc/hosts
+#
+#	The file contains newline-separated definitions, in the
+#	form ip_address_in_dotted_form name [name ...] names are
+#	whitespace-separated. Lines beginning with an hash (#)
+#	character are comments.
+#
+#	The file is checked at startup and upon configuration.
+#	If set to 'none', it won't be checked.
+#	If append_domain is used, that domain will be added to
+#	domain-local (i.e. not containing any dot character) host
+#	definitions.
+#Default:
+# hosts_file /etc/hosts
+
+#  TAG: append_domain
+#	Appends local domain name to hostnames without any dots in
+#	them.  append_domain must begin with a period.
+#
+#	Be warned there are now Internet names with no dots in
+#	them using only top-domain names, so setting this may
+#	cause some Internet sites to become unavailable.
+#
+#Example:
+# append_domain .yourdomain.com
+#Default:
+# Use operating system definitions
+
+#  TAG: ignore_unknown_nameservers
+#	By default Squid checks that DNS responses are received
+#	from the same IP addresses they are sent to.  If they
+#	don't match, Squid ignores the response and writes a warning
+#	message to cache.log.  You can allow responses from unknown
+#	nameservers by setting this option to 'off'.
+#Default:
+# ignore_unknown_nameservers on
+
+#  TAG: dns_v4_first
+#	With the IPv6 Internet being as fast or faster than IPv4 Internet
+#	for most networks Squid prefers to contact websites over IPv6.
+#
+#	This option reverses the order of preference to make Squid contact
+#	dual-stack websites over IPv4 first. Squid will still perform both
+#	IPv6 and IPv4 DNS lookups before connecting.
+#
+#	WARNING:
+#	  This option will restrict the situations under which IPv6
+#	  connectivity is used (and tested), potentially hiding network
+#	  problems which would otherwise be detected and warned about.
+#Default:
+# dns_v4_first off
+
+#  TAG: ipcache_size	(number of entries)
+#	Maximum number of DNS IP cache entries.
+#Default:
+# ipcache_size 1024
+
+#  TAG: ipcache_low	(percent)
+#Default:
+# ipcache_low 90
+
+#  TAG: ipcache_high	(percent)
+#	The size, low-, and high-water marks for the IP cache.
+#Default:
+# ipcache_high 95
+
+#  TAG: fqdncache_size	(number of entries)
+#	Maximum number of FQDN cache entries.
+#Default:
+# fqdncache_size 1024
+
+# MISCELLANEOUS
+# -----------------------------------------------------------------------------
+
+#  TAG: configuration_includes_quoted_values	on|off
+#	If set, Squid will recognize each "quoted string" after a configuration
+#	directive as a single parameter. The quotes are stripped before the
+#	parameter value is interpreted or used.
+#	See "Values with spaces, quotes, and other special characters"
+#	section for more details.
+#Default:
+# configuration_includes_quoted_values off
+
+#  TAG: memory_pools	on|off
+#	If set, Squid will keep pools of allocated (but unused) memory
+#	available for future use.  If memory is a premium on your
+#	system and you believe your malloc library outperforms Squid
+#	routines, disable this.
+#Default:
+# memory_pools on
+
+#  TAG: memory_pools_limit	(bytes)
+#	Used only with memory_pools on:
+#	memory_pools_limit 50 MB
+#
+#	If set to a non-zero value, Squid will keep at most the specified
+#	limit of allocated (but unused) memory in memory pools. All free()
+#	requests that exceed this limit will be handled by your malloc
+#	library. Squid does not pre-allocate any memory, just safe-keeps
+#	objects that otherwise would be free()d. Thus, it is safe to set
+#	memory_pools_limit to a reasonably high value even if your
+#	configuration will use less memory.
+#
+#	If set to none, Squid will keep all memory it can. That is, there
+#	will be no limit on the total amount of memory used for safe-keeping.
+#
+#	To disable memory allocation optimization, do not set
+#	memory_pools_limit to 0 or none. Set memory_pools to "off" instead.
+#
+#	An overhead for maintaining memory pools is not taken into account
+#	when the limit is checked. This overhead is close to four bytes per
+#	object kept. However, pools may actually _save_ memory because of
+#	reduced memory thrashing in your malloc library.
+#Default:
+# memory_pools_limit 5 MB
+
+#  TAG: forwarded_for	on|off|transparent|truncate|delete
+#	If set to "on", Squid will append your client's IP address
+#	in the HTTP requests it forwards. By default it looks like:
+#
+#		X-Forwarded-For: 192.1.2.3
+#
+#	If set to "off", it will appear as
+#
+#		X-Forwarded-For: unknown
+#
+#	If set to "transparent", Squid will not alter the
+#	X-Forwarded-For header in any way.
+#
+#	If set to "delete", Squid will delete the entire
+#	X-Forwarded-For header.
+#
+#	If set to "truncate", Squid will remove all existing
+#	X-Forwarded-For entries, and place the client IP as the sole entry.
+#Default:
+# forwarded_for on
+
+#  TAG: cachemgr_passwd
+#	Specify passwords for cachemgr operations.
+#
+#	Usage: cachemgr_passwd password action action ...
+#
+#	Some valid actions are (see cache manager menu for a full list):
+#		5min
+#		60min
+#		asndb
+#		authenticator
+#		cbdata
+#		client_list
+#		comm_incoming
+#		config *
+#		counters
+#		delay
+#		digest_stats
+#		dns
+#		events
+#		filedescriptors
+#		fqdncache
+#		histograms
+#		http_headers
+#		info
+#		io
+#		ipcache
+#		mem
+#		menu
+#		netdb
+#		non_peers
+#		objects
+#		offline_toggle *
+#		pconn
+#		peer_select
+#		reconfigure *
+#		redirector
+#		refresh
+#		server_list
+#		shutdown *
+#		store_digest
+#		storedir
+#		utilization
+#		via_headers
+#		vm_objects
+#
+#	* Indicates actions which will not be performed without a
+#	  valid password, others can be performed if not listed here.
+#
+#	To disable an action, set the password to "disable".
+#	To allow performing an action without a password, set the
+#	password to "none".
+#
+#	Use the keyword "all" to set the same password for all actions.
+#
+#Example:
+# cachemgr_passwd secret shutdown
+# cachemgr_passwd lesssssssecret info stats/objects
+# cachemgr_passwd disable all
+#Default:
+# No password. Actions which require password are denied.
+
+#  TAG: client_db	on|off
+#	If you want to disable collecting per-client statistics,
+#	turn off client_db here.
+#Default:
+# client_db on
+
+#  TAG: refresh_all_ims	on|off
+#	When you enable this option, squid will always check
+#	the origin server for an update when a client sends an
+#	If-Modified-Since request.  Many browsers use IMS
+#	requests when the user requests a reload, and this
+#	ensures those clients receive the latest version.
+#
+#	By default (off), squid may return a Not Modified response
+#	based on the age of the cached version.
+#Default:
+# refresh_all_ims off
+
+#  TAG: reload_into_ims	on|off
+#	When you enable this option, client no-cache or ``reload''
+#	requests will be changed to If-Modified-Since requests.
+#	Doing this VIOLATES the HTTP standard.  Enabling this
+#	feature could make you liable for problems which it
+#	causes.
+#
+#	see also refresh_pattern for a more selective approach.
+#Default:
+# reload_into_ims off
+
+#  TAG: connect_retries
+#	This sets the maximum number of connection attempts made for each
+#	TCP connection. The connect_retries attempts must all still
+#	complete within the connection timeout period.
+#
+#	The default is not to re-try if the first connection attempt fails.
+#	The (not recommended) maximum is 10 tries.
+#
+#	A warning message will be generated if it is set to a too-high
+#	value and the configured value will be over-ridden.
+#
+#	Note: These re-tries are in addition to forward_max_tries
+#	which limit how many different addresses may be tried to find
+#	a useful server.
+#Default:
+# Do not retry failed connections.
+
+#  TAG: retry_on_error
+#	If set to ON Squid will automatically retry requests when
+#	receiving an error response with status 403 (Forbidden),
+#	500 (Internal Error), 501 or 503 (Service not available).
+#	Status 502 and 504 (Gateway errors) are always retried.
+#
+#	This is mainly useful if you are in a complex cache hierarchy to
+#	work around access control errors.
+#
+#	NOTE: This retry will attempt to find another working destination.
+#	Which is different from the server which just failed.
+#Default:
+# retry_on_error off
+
+#  TAG: as_whois_server
+#	WHOIS server to query for AS numbers.  NOTE: AS numbers are
+#	queried only when Squid starts up, not for every request.
+#Default:
+# as_whois_server whois.ra.net
+
+#  TAG: offline_mode
+#	Enable this option and Squid will never try to validate cached
+#	objects.
+#Default:
+# offline_mode off
+
+#  TAG: uri_whitespace
+#	What to do with requests that have whitespace characters in the
+#	URI.  Options:
+#
+#	strip:  The whitespace characters are stripped out of the URL.
+#		This is the behavior recommended by RFC2396 and RFC3986
+#		for tolerant handling of generic URI.
+#		NOTE: This is one difference between generic URI and HTTP URLs.
+#
+#	deny:   The request is denied.  The user receives an "Invalid
+#		Request" message.
+#		This is the behaviour recommended by RFC2616 for safe
+#		handling of HTTP request URL.
+#
+#	allow:  The request is allowed and the URI is not changed.  The
+#		whitespace characters remain in the URI.  Note the
+#		whitespace is passed to redirector processes if they
+#		are in use.
+#		Note this may be considered a violation of RFC2616
+#		request parsing where whitespace is prohibited in the
+#		URL field.
+#
+#	encode:	The request is allowed and the whitespace characters are
+#		encoded according to RFC1738.
+#
+#	chop:	The request is allowed and the URI is chopped at the
+#		first whitespace.
+#
+#
+#	NOTE the current Squid implementation of encode and chop violates
+#	RFC2616 by not using a 301 redirect after altering the URL.
+#Default:
+# uri_whitespace strip
+
+#  TAG: chroot
+#	Specifies a directory where Squid should do a chroot() while
+#	initializing.  This also causes Squid to fully drop root
+#	privileges after initializing.  This means, for example, if you
+#	use a HTTP port less than 1024 and try to reconfigure, you may
+#	get an error saying that Squid can not open the port.
+#Default:
+# none
+
+#  TAG: balance_on_multiple_ip
+#	Modern IP resolvers in squid sort lookup results by preferred access.
+#	By default squid will use these IP in order and only rotates to
+#	the next listed when the most preffered fails.
+#
+#	Some load balancing servers based on round robin DNS have been
+#	found not to preserve user session state across requests
+#	to different IP addresses.
+#
+#	Enabling this directive Squid rotates IP's per request.
+#Default:
+# balance_on_multiple_ip off
+
+#  TAG: pipeline_prefetch
+#	HTTP clients may send a pipeline of 1+N requests to Squid using a
+#	single connection, without waiting for Squid to respond to the first
+#	of those requests. This option limits the number of concurrent
+#	requests Squid will try to handle in parallel. If set to N, Squid
+#	will try to receive and process up to 1+N requests on the same
+#	connection concurrently.
+#
+#	Defaults to 0 (off) for bandwidth management and access logging
+#	reasons.
+#
+#	NOTE: pipelining requires persistent connections to clients.
+#
+#	WARNING: pipelining breaks NTLM and Negotiate/Kerberos authentication.
+#Default:
+# Do not pre-parse pipelined requests.
+
+#  TAG: high_response_time_warning	(msec)
+#	If the one-minute median response time exceeds this value,
+#	Squid prints a WARNING with debug level 0 to get the
+#	administrators attention.  The value is in milliseconds.
+#Default:
+# disabled.
+
+#  TAG: high_page_fault_warning
+#	If the one-minute average page fault rate exceeds this
+#	value, Squid prints a WARNING with debug level 0 to get
+#	the administrators attention.  The value is in page faults
+#	per second.
+#Default:
+# disabled.
+
+#  TAG: high_memory_warning
+# Note: This option is only available if Squid is rebuilt with the
+#       GNU Malloc with mstats()
+#
+#	If the memory usage (as determined by gnumalloc, if available and used)
+#	exceeds	this amount, Squid prints a WARNING with debug level 0 to get
+#	the administrators attention.
+#Default:
+# disabled.
+
+#  TAG: sleep_after_fork	(microseconds)
+#	When this is set to a non-zero value, the main Squid process
+#	sleeps the specified number of microseconds after a fork()
+#	system call. This sleep may help the situation where your
+#	system reports fork() failures due to lack of (virtual)
+#	memory. Note, however, if you have a lot of child
+#	processes, these sleep delays will add up and your
+#	Squid will not service requests for some amount of time
+#	until all the child processes have been started.
+#	On Windows value less then 1000 (1 milliseconds) are
+#	rounded to 1000.
+#Default:
+# sleep_after_fork 0
+
+#  TAG: windows_ipaddrchangemonitor	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       MS Windows
+#
+#	On Windows Squid by default will monitor IP address changes and will
+#	reconfigure itself after any detected event. This is very useful for
+#	proxies connected to internet with dial-up interfaces.
+#	In some cases (a Proxy server acting as VPN gateway is one) it could be
+#	desiderable to disable this behaviour setting this to 'off'.
+#	Note: after changing this, Squid service must be restarted.
+#Default:
+# windows_ipaddrchangemonitor on
+
+#  TAG: eui_lookup
+#	Whether to lookup the EUI or MAC address of a connected client.
+#Default:
+# eui_lookup on
+
+#  TAG: max_filedescriptors
+#	Reduce the maximum number of filedescriptors supported below
+#	the usual operating system defaults.
+#
+#	Remove from squid.conf to inherit the current ulimit setting.
+#
+#	Note: Changing this requires a restart of Squid. Also
+#	not all I/O types supports large values (eg on Windows).
+#Default:
+# Use operating system limits set by ulimit.