Merge pull request #1535 from monitoring-plugins/feature_check_curl

Feature check curl

18 files changed, 4325 insertions, 59 deletions

diff --git a/.gitignore b/.gitignore
index 0c16addf..c7b668e2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -142,6 +142,7 @@ NP-VERSION-FILE
 /plugins/check_by_ssh
 /plugins/check_clamd
 /plugins/check_cluster
+/plugins/check_curl
 /plugins/check_dbi
 /plugins/check_dig
 /plugins/check_disk
@@ -202,6 +203,12 @@ NP-VERSION-FILE
 /plugins/stamp-h*
 /plugins/urlize
 
+# /plugins/picohttpparser
+/plugins/picohttpparser/Makefile
+/plugins/picohttpparser/Makefile.in
+/plugins/picohttpparser/.deps
+/plugins/picohttpparser/libpicohttpparser.a
+
 # /plugins/t/
 /plugins/t/*.tmp
 
diff --git a/.travis.yml b/.travis.yml
index 946345c4..3d9fe64e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,6 +51,8 @@ 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 libcurl4-openssl-dev
+  - sudo apt-get install -qq --no-install-recommends liburiparser-dev
   - sudo apt-get install -qq --no-install-recommends squid
   # 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
diff --git a/ACKNOWLEDGEMENTS b/ACKNOWLEDGEMENTS
index 50c714c3..d73be549 100644
--- a/ACKNOWLEDGEMENTS
+++ b/ACKNOWLEDGEMENTS
@@ -20,7 +20,7 @@ Using the DLPI support on SysV systems to get the host MAC address in check_dhcp
 Stenberg, Daniel
 Copyright (c) 1996 - 2004, Daniel Stenberg, <daniel@haxx.se>
 http://curl.haxx.se/
-Use of duplication of macros in m4/np_curl.m4
+Use of duplication of macros in m4/np_curl.m4 (slighly adapted for m4/uriparser.m4 too)
 
 Coreutils team
 Copyright (C) 91, 1995-2004 Free Software Foundation, Inc.
@@ -31,3 +31,9 @@ Gnulib team
 Copyright (C) 2001, 2003, 2004, 2006 Free Software Foundation, Inc
 http://www.gnu.org/software/gnulib/
 Use of lib files that originally were used from coreutils
+
+Copyright (c) 2009-2014 Kazuho Oku, Tokuhiro Matsuno, Daisuke Murase,
+                        Shigeo Mitsunari
+picohttpparser
+https://github.com/h2o/picohttpparser
+Use of the library for HTTP header parsing in check_curl.
diff --git a/REQUIREMENTS b/REQUIREMENTS
index ac7b5935..f3b1c01d 100644
--- a/REQUIREMENTS
+++ b/REQUIREMENTS
@@ -11,6 +11,22 @@ check_ldaps, check_http --ssl, check_tcp --ssl, check_smtp --starttls
 	- Requires openssl or gnutls libraries for SSL connections
 	  http://www.openssl.org, http://www.gnu.org/software/gnutls
 
+check_curl:
+	- Requires libcurl 7.15.2 or later
+	  http://www.haxx.se
+	- --ssl/-S and -C requires OpenSSL for certificate checks, otherwise
+	  libcurl must be quite new to support CURLINFO_CERTINFO with
+	  GnuTLS and NSS libraries:
+	  - 7.42.0 or newer for GnuTLS
+	  - 7.34.0 or newer for NSS
+	  GnuTLS is known to create problems on some distributions with
+	  self-signed certificate chains
+	  http://www.openssl.org, http://www.gnu.org/software/gnutls,
+	  http://www.mozilla.org/projects/security/pki/nss/,
+	  other SSL implementations are currently not supported
+	- uriparser 0.7.5 or later
+	  https://uriparser.github.io/
+      
 check_fping:
 	- Requires the fping utility distributed with SATAN.  Either
 	  download and install SATAN or grab the fping program from
diff --git a/configure.ac b/configure.ac
index 4a9a92a8..4aebc2ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -385,6 +385,42 @@ if test "$ac_cv_header_wtsapi32_h" = "yes"; then
   AC_SUBST(WTSAPI32LIBS)
 fi
 
+_can_enable_check_curl=no
+dnl Check for cURL library
+LIBCURL_CHECK_CONFIG(yes, 7.15.2, [
+    _can_enable_check_curl=yes
+    LIBCURLINCLUDE="$LIBCURL_CPPFLAGS"
+    LIBCURLLIBS="$LIBCURL"
+    LIBCURLCFLAGS="$LIBCURL_CPPFLAGS"
+    AC_SUBST(LIBCURLINCLUDE)
+    AC_SUBST(LIBCURLLIBS)
+    AC_SUBST(LIBCURLCFLAGS)
+  ], [
+    _can_enable_check_curl=no
+    AC_MSG_WARN([Skipping curl plugin])
+    AC_MSG_WARN([install libcurl libs to compile this plugin (see REQUIREMENTS).])
+])
+
+dnl Check for uriparser library
+URIPARSER_CHECK(yes, 0.7.5, [
+    URIPARSERINCLUDE="$URIPARSER_CPPFLAGS"
+    URIPARSERLIBS="$URIPARSER"
+    URIPARSERCFLAGS="$URIPARSER_CPPFLAGS"
+    AC_SUBST(URIPARSERINCLUDE)
+    AC_SUBST(URIPARSERLIBS)
+    AC_SUBST(URIPARSERCFLAGS)
+  ], [
+    _can_enable_check_curl=no
+    AC_MSG_WARN([Skipping curl plugin])
+    AC_MSG_WARN([install the uriparser library to compile this plugin (see REQUIREMENTS).])
+])
+
+dnl prerequisites met, enable the plugin
+if test x$_can_enable_check_curl = xyes; then
+  EXTRAS="$EXTRAS check_curl\$(EXEEXT)"
+fi
+AC_CONFIG_FILES([plugins/picohttpparser/Makefile])
+
 dnl Fallback to who(1) if the system doesn't provide an utmpx(5) interface
 if test "$ac_cv_header_utmpx_h" = "no" -a "$ac_cv_header_wtsapi32_h" = "no"
 then
@@ -1894,4 +1930,5 @@ ACX_FEATURE([enable],[perl-modules])
 ACX_FEATURE([with],[cgiurl])
 ACX_FEATURE([with],[trusted-path])
 ACX_FEATURE([enable],[libtap])
-
+ACX_FEATURE([with],[libcurl])
+ACX_FEATURE([with],[uriparser])
diff --git a/m4/libcurl.m4 b/m4/libcurl.m4
new file mode 100644
index 00000000..53d694d0
--- /dev/null
+++ b/m4/libcurl.m4
@@ -0,0 +1,272 @@
+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 2006, David Shaw <dshaw@jabberwocky.com>
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.haxx.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+###########################################################################
+# LIBCURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],
+#                       [ACTION-IF-YES], [ACTION-IF-NO])
+# ----------------------------------------------------------
+#      David Shaw <dshaw@jabberwocky.com>   May-09-2006
+#
+# Checks for libcurl.  DEFAULT-ACTION is the string yes or no to
+# specify whether to default to --with-libcurl or --without-libcurl.
+# If not supplied, DEFAULT-ACTION is yes.  MINIMUM-VERSION is the
+# minimum version of libcurl to accept.  Pass the version as a regular
+# version number like 7.10.1. If not supplied, any version is
+# accepted.  ACTION-IF-YES is a list of shell commands to run if
+# libcurl was successfully found and passed the various tests.
+# ACTION-IF-NO is a list of shell commands that are run otherwise.
+# Note that using --without-libcurl does run ACTION-IF-NO.
+#
+# This macro #defines HAVE_LIBCURL if a working libcurl setup is
+# found, and sets @LIBCURL@ and @LIBCURL_CPPFLAGS@ to the necessary
+# values.  Other useful defines are LIBCURL_FEATURE_xxx where xxx are
+# the various features supported by libcurl, and LIBCURL_PROTOCOL_yyy
+# where yyy are the various protocols supported by libcurl.  Both xxx
+# and yyy are capitalized.  See the list of AH_TEMPLATEs at the top of
+# the macro for the complete list of possible defines.  Shell
+# variables $libcurl_feature_xxx and $libcurl_protocol_yyy are also
+# defined to 'yes' for those features and protocols that were found.
+# Note that xxx and yyy keep the same capitalization as in the
+# curl-config list (e.g. it's "HTTP" and not "http").
+#
+# Users may override the detected values by doing something like:
+# LIBCURL="-lcurl" LIBCURL_CPPFLAGS="-I/usr/myinclude" ./configure
+#
+# For the sake of sanity, this macro assumes that any libcurl that is
+# found is after version 7.7.2, the first version that included the
+# curl-config script.  Note that it is very important for people
+# packaging binary versions of libcurl to include this script!
+# Without curl-config, we can only guess what protocols are available,
+# or use curl_version_info to figure it out at runtime.
+
+AC_DEFUN([LIBCURL_CHECK_CONFIG],
+[
+  AH_TEMPLATE([LIBCURL_FEATURE_SSL],[Defined if libcurl supports SSL])
+  AH_TEMPLATE([LIBCURL_FEATURE_KRB4],[Defined if libcurl supports KRB4])
+  AH_TEMPLATE([LIBCURL_FEATURE_IPV6],[Defined if libcurl supports IPv6])
+  AH_TEMPLATE([LIBCURL_FEATURE_LIBZ],[Defined if libcurl supports libz])
+  AH_TEMPLATE([LIBCURL_FEATURE_ASYNCHDNS],[Defined if libcurl supports AsynchDNS])
+  AH_TEMPLATE([LIBCURL_FEATURE_IDN],[Defined if libcurl supports IDN])
+  AH_TEMPLATE([LIBCURL_FEATURE_SSPI],[Defined if libcurl supports SSPI])
+  AH_TEMPLATE([LIBCURL_FEATURE_NTLM],[Defined if libcurl supports NTLM])
+
+  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTP],[Defined if libcurl supports HTTP])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTPS],[Defined if libcurl supports HTTPS])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_FTP],[Defined if libcurl supports FTP])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_FTPS],[Defined if libcurl supports FTPS])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_FILE],[Defined if libcurl supports FILE])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_TELNET],[Defined if libcurl supports TELNET])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_LDAP],[Defined if libcurl supports LDAP])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_DICT],[Defined if libcurl supports DICT])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_TFTP],[Defined if libcurl supports TFTP])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_RTSP],[Defined if libcurl supports RTSP])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_POP3],[Defined if libcurl supports POP3])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_IMAP],[Defined if libcurl supports IMAP])
+  AH_TEMPLATE([LIBCURL_PROTOCOL_SMTP],[Defined if libcurl supports SMTP])
+
+  AC_ARG_WITH(libcurl,
+     AS_HELP_STRING([--with-libcurl=PREFIX],[look for the curl library in PREFIX/lib and headers in PREFIX/include]),
+     [_libcurl_with=$withval],[_libcurl_with=ifelse([$1],,[yes],[$1])])
+
+  if test "$_libcurl_with" != "no" ; then
+
+     AC_PROG_AWK
+
+     _libcurl_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"
+
+     _libcurl_try_link=yes
+
+     if test -d "$_libcurl_with" ; then
+        LIBCURL_CPPFLAGS="-I$withval/include"
+        _libcurl_ldflags="-L$withval/lib"
+        AC_PATH_PROG([_libcurl_config],[curl-config],[],
+                     ["$withval/bin"])
+     else
+        AC_PATH_PROG([_libcurl_config],[curl-config],[],[$PATH])
+     fi
+
+     if test x$_libcurl_config != "x" ; then
+        AC_CACHE_CHECK([for the version of libcurl],
+           [libcurl_cv_lib_curl_version],
+           [libcurl_cv_lib_curl_version=`$_libcurl_config --version | $AWK '{print $[]2}'`])
+
+        _libcurl_version=`echo $libcurl_cv_lib_curl_version | $_libcurl_version_parse`
+        _libcurl_wanted=`echo ifelse([$2],,[0],[$2]) | $_libcurl_version_parse`
+
+        if test $_libcurl_wanted -gt 0 ; then
+           AC_CACHE_CHECK([for libcurl >= version $2],
+              [libcurl_cv_lib_version_ok],
+              [
+              if test $_libcurl_version -ge $_libcurl_wanted ; then
+                 libcurl_cv_lib_version_ok=yes
+              else
+                 libcurl_cv_lib_version_ok=no
+              fi
+              ])
+        fi
+
+        if test $_libcurl_wanted -eq 0 || test x$libcurl_cv_lib_version_ok = xyes ; then
+           if test x"$LIBCURL_CPPFLAGS" = "x" ; then
+              LIBCURL_CPPFLAGS=`$_libcurl_config --cflags`
+           fi
+           if test x"$LIBCURL" = "x" ; then
+              LIBCURL=`$_libcurl_config --libs`
+
+              # This is so silly, but Apple actually has a bug in their
+              # curl-config script.  Fixed in Tiger, but there are still
+              # lots of Panther installs around.
+              case "${host}" in
+                 powerpc-apple-darwin7*)
+                    LIBCURL=`echo $LIBCURL | sed -e 's|-arch i386||g'`
+                 ;;
+              esac
+           fi
+
+           # All curl-config scripts support --feature
+           _libcurl_features=`$_libcurl_config --feature`
+
+           # Is it modern enough to have --protocols? (7.12.4)
+           if test $_libcurl_version -ge 461828 ; then
+              _libcurl_protocols=`$_libcurl_config --protocols`
+           fi
+        else
+           _libcurl_try_link=no
+        fi
+
+        unset _libcurl_wanted
+     fi
+
+     if test $_libcurl_try_link = yes ; then
+
+        # we didn't find curl-config, so let's see if the user-supplied
+        # link line (or failing that, "-lcurl") is enough.
+        LIBCURL=${LIBCURL-"$_libcurl_ldflags -lcurl"}
+
+        AC_CACHE_CHECK([whether libcurl is usable],
+           [libcurl_cv_lib_curl_usable],
+           [
+           _libcurl_save_cppflags=$CPPFLAGS
+           CPPFLAGS="$LIBCURL_CPPFLAGS $CPPFLAGS"
+           _libcurl_save_libs=$LIBS
+           LIBS="$LIBCURL $LIBS"
+
+           AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <curl/curl.h>]],[[
+/* Try and use a few common options to force a failure if we are
+   missing symbols or can't link. */
+int x;
+curl_easy_setopt(NULL,CURLOPT_URL,NULL);
+x=CURL_ERROR_SIZE;
+x=CURLOPT_WRITEFUNCTION;
+x=CURLOPT_WRITEDATA;
+x=CURLOPT_ERRORBUFFER;
+x=CURLOPT_STDERR;
+x=CURLOPT_VERBOSE;
+if (x) {;}
+]])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
+
+           CPPFLAGS=$_libcurl_save_cppflags
+           LIBS=$_libcurl_save_libs
+           unset _libcurl_save_cppflags
+           unset _libcurl_save_libs
+           ])
+
+        if test $libcurl_cv_lib_curl_usable = yes ; then
+
+           # Does curl_free() exist in this version of libcurl?
+           # If not, fake it with free()
+
+           _libcurl_save_cppflags=$CPPFLAGS
+           CPPFLAGS="$CPPFLAGS $LIBCURL_CPPFLAGS"
+           _libcurl_save_libs=$LIBS
+           LIBS="$LIBS $LIBCURL"
+
+           AC_CHECK_FUNC(curl_free,,
+              AC_DEFINE(curl_free,free,
+                [Define curl_free() as free() if our version of curl lacks curl_free.]))
+
+           CPPFLAGS=$_libcurl_save_cppflags
+           LIBS=$_libcurl_save_libs
+           unset _libcurl_save_cppflags
+           unset _libcurl_save_libs
+
+           AC_DEFINE(HAVE_LIBCURL,1,
+             [Define to 1 if you have a functional curl library.])
+           AC_SUBST(LIBCURL_CPPFLAGS)
+           AC_SUBST(LIBCURL)
+
+           for _libcurl_feature in $_libcurl_features ; do
+              AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_feature_$_libcurl_feature),[1])
+              eval AS_TR_SH(libcurl_feature_$_libcurl_feature)=yes
+           done
+
+           if test "x$_libcurl_protocols" = "x" ; then
+
+              # We don't have --protocols, so just assume that all
+              # protocols are available
+              _libcurl_protocols="HTTP FTP FILE TELNET LDAP DICT TFTP"
+
+              if test x$libcurl_feature_SSL = xyes ; then
+                 _libcurl_protocols="$_libcurl_protocols HTTPS"
+
+                 # FTPS wasn't standards-compliant until version
+                 # 7.11.0 (0x070b00 == 461568)
+                 if test $_libcurl_version -ge 461568; then
+                    _libcurl_protocols="$_libcurl_protocols FTPS"
+                 fi
+              fi
+
+              # RTSP, IMAP, POP3 and SMTP were added in
+              # 7.20.0 (0x071400 == 463872)
+              if test $_libcurl_version -ge 463872; then
+                 _libcurl_protocols="$_libcurl_protocols RTSP IMAP POP3 SMTP"
+              fi
+           fi
+
+           for _libcurl_protocol in $_libcurl_protocols ; do
+              AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])
+              eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes
+           done
+        else
+           unset LIBCURL
+           unset LIBCURL_CPPFLAGS
+        fi
+     fi
+
+     unset _libcurl_try_link
+     unset _libcurl_version_parse
+     unset _libcurl_config
+     unset _libcurl_feature
+     unset _libcurl_features
+     unset _libcurl_protocol
+     unset _libcurl_protocols
+     unset _libcurl_version
+     unset _libcurl_ldflags
+  fi
+
+  if test x$_libcurl_with = xno || test x$libcurl_cv_lib_curl_usable != xyes ; then
+     # This is the IF-NO path
+     ifelse([$4],,:,[$4])
+  else
+     # This is the IF-YES path
+     ifelse([$3],,:,[$3])
+  fi
+
+  unset _libcurl_with
+])dnl
diff --git a/m4/uriparser.m4 b/m4/uriparser.m4
new file mode 100644
index 00000000..dbb8a551
--- /dev/null
+++ b/m4/uriparser.m4
@@ -0,0 +1,140 @@
+# (this check is rougly based on and inspired libcurl.m4)
+# URIPARSER_CHECK ([DEFAULT-ACTION], [MINIMUM-VERSION],
+#                       [ACTION-IF-YES], [ACTION-IF-NO])
+# Checks for uriparser library.  DEFAULT-ACTION is the string yes or no to
+# specify whether to default to --with-uriparser or --without-liburiparser.
+# If not supplied, DEFAULT-ACTION is yes.  MINIMUM-VERSION is the
+# minimum version of uriparser to accept.  Pass the version as a regular
+# version number like 0.8.5. If not supplied, any version is
+# accepted.  ACTION-IF-YES is a list of shell commands to run if
+# uriparser was successfully found and passed the various tests.
+# ACTION-IF-NO is a list of shell commands that are run otherwise.
+# Note that using --without-uriparser does run ACTION-IF-NO.
+#
+# This macro #defines HAVE_URIPARSER if a working uriparser setup is
+# found, and sets @URIPARSER@ and @URIPARSER_CPPFLAGS@ to the necessary
+# values.
+#
+# Users may override the detected values by doing something like:
+# URIPARSER="-luriparser" URIPARSER_CPPFLAGS="-I/usr/myinclude" ./configure
+#
+
+AC_DEFUN([URIPARSER_CHECK],
+[
+  AC_ARG_WITH(uriparser,
+     AS_HELP_STRING([--with-uriparser=PREFIX],[look for the uriparser library in PREFIX/lib and headers in PREFIX/include]),
+     [_uriparser_with=$withval],[_uriparser_with=ifelse([$1],,[yes],[$1])])
+
+  if test "$_uriparser_with" != "no" ; then
+
+     _uriparser_try_link=yes
+
+     AC_CHECK_PROG(PKGCONFIG,pkg-config,pkg-config,no)
+
+     if test "x$URIPARSER" != "x" || test "x$URIPARSER_CPPFLAGS" != "x"; then
+        :
+     elif test -d "$_uriparser_with" ; then
+        URIPARSER_CPPFLAGS="-I$withval/include"
+        _uriparser_ldflags="-L$withval/lib"
+
+     elif test x$PKGCONFIG != xno; then
+
+        AC_CACHE_CHECK([for the version of uriparser],
+           [uriparser_cv_uriparser_version],
+           [uriparser_cv_uriparser_version=`$PKGCONFIG liburiparser --modversion`])
+
+        AC_PROG_AWK
+
+        _uriparser_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"
+
+        _uriparser_version=`echo $uriparser_cv_uriparser_version | $_uriparser_version_parse`
+        _uriparser_wanted=`echo ifelse([$2],,[0],[$2]) | $_uriparser_version_parse`
+
+        if test $_uriparser_wanted -gt 0 ; then
+           AC_CACHE_CHECK([for uriparser >= version $2],
+              [uriparser_cv_lib_version_ok],
+              [
+              if test $_uriparser_version -ge $_uriparser_wanted ; then
+                 uriparser_cv_lib_version_ok=yes
+              else
+                 uriparser_cv_lib_version_ok=no
+              fi
+              ])
+        fi
+
+        if test $_uriparser_wanted -eq 0 || test x$uriparser_cv_lib_version_ok = xyes ; then
+           if test x"$URIPARSER_CPPFLAGS" = "x" ; then
+              URIPARSER_CPPFLAGS=`$PKGCONFIG liburiparser --cflags`
+           fi
+           if test x"$URIPARSER" = "x" ; then
+              URIPARSER=`$PKGCONFIG liburiparser --libs`
+           fi
+        else
+           _uriparser_try_link=no
+        fi
+
+        unset _uriparser_wanted
+     else
+        dnl no pkg-config, ok, do our best and set some defaults
+        URIPARSER_CPPFLAGS="-I/usr/include"
+        URIPARSER="-luriparser -L/usr/lib -L/usr/lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/i686-linux-gnu"
+     fi
+
+     if test $_uriparser_try_link = yes ; then
+
+        # let's see if the user-supplied
+        # link line (or failing that, "-luriparser") is enough.
+        URIPARSER=${URIPARSER-"$_uriparser_ldflags -luriparser"}
+
+        AC_CACHE_CHECK([whether uriparser is usable],
+           [uriparser_cv_lib_uriparser_usable],
+           [
+           _liburiparser_save_cppflags=$CPPFLAGS
+           CPPFLAGS="$URIPARSER_CPPFLAGS $CPPFLAGS"
+           _liburiparser_save_libs=$LIBS
+           LIBS="$URIPARSER $LIBS"
+
+           AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <uriparser/Uri.h>]],[[
+/* Try and use a few common options to force a failure if we are
+   missing symbols or cannot link. */
+UriParserStateA state;
+UriUriA uri;
+state.uri = &uri;
+char *location = "http://test.dom/dir/file.ext";
+int x = uriParseUriA (&state, location);
+if (x == URI_SUCCESS) {;}
+]])],uriparser_cv_lib_uriparser_usable=yes,uriparser_cv_lib_uriparser_usable=no)
+
+           CPPFLAGS=$_liburiparser_save_cppflags
+           LIBS=$_liburiparser_save_libs
+           unset _liburiparser_save_cppflags
+           unset _liburiparser_save_libs
+           ])
+
+        if test $uriparser_cv_lib_uriparser_usable = yes ; then
+           AC_DEFINE(HAVE_URIPARSER,1,
+             [Define to 1 if you have a functional uriparser library.])
+           AC_SUBST(URIPARSER_CPPFLAGS)
+           AC_SUBST(URIPARSER)
+        else
+           unset URIPARSER
+           unset URIPARSER_CPPFLAGS
+        fi
+     fi
+
+     unset _uriparser_try_link
+     unset _uriparser_version_parse
+     unset _uriparser_version
+     unset _uriparser_ldflags
+  fi
+
+  if test x$_uriparser_with = xno || test x$uriparser_cv_lib_uriparser_usable != xyes ; then
+     # This is the IF-NO path
+     ifelse([$4],,:,[$4])
+  else
+     # This is the IF-YES path
+     ifelse([$3],,:,[$3])
+  fi
+
+  unset _uriparser_with
+])dnl
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 0ddf9bd1..3fde54d6 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -38,7 +38,9 @@ check_tcp_programs = check_ftp check_imap check_nntp check_pop \
 EXTRA_PROGRAMS = check_mysql check_radius check_pgsql check_snmp check_hpjd \
 	check_swap check_fping check_ldap check_game check_dig \
 	check_nagios check_by_ssh check_dns check_nt check_ide_smart	\
-	check_procs check_mysql_query check_apt check_dbi
+	check_procs check_mysql_query check_apt check_dbi check_curl
+
+SUBDIRS = picohttpparser
 
 EXTRA_DIST = t tests
 
@@ -69,6 +71,9 @@ test-debug:
 
 check_apt_LDADD = $(BASEOBJS)
 check_cluster_LDADD = $(BASEOBJS)
+check_curl_CFLAGS = $(AM_CFLAGS) $(LIBCURLCFLAGS) $(URIPARSERCFLAGS) $(LIBCURLINCLUDE) $(URIPARSERINCLUDE) -Ipicohttpparser
+check_curl_CPPFLAGS = $(AM_CPPFLAGS) $(LIBCURLCFLAGS) $(URIPARSERCFLAGS) $(LIBCURLINCLUDE) $(URIPARSERINCLUDE) -Ipicohttpparser
+check_curl_LDADD = $(NETLIBS) $(LIBCURLLIBS) $(SSLOBJS) $(URIPARSERLIBS) picohttpparser/libpicohttpparser.a
 check_dbi_LDADD = $(NETLIBS) $(DBILIBS)
 check_dig_LDADD = $(NETLIBS)
 check_disk_LDADD = $(BASEOBJS)
@@ -89,7 +94,7 @@ check_mysql_query_CFLAGS = $(AM_CFLAGS) $(MYSQLCFLAGS)
 check_mysql_query_CPPFLAGS = $(AM_CPPFLAGS) $(MYSQLINCLUDE)
 check_mysql_query_LDADD = $(NETLIBS) $(MYSQLLIBS)
 check_nagios_LDADD = $(BASEOBJS)
-check_nt_LDADD = $(NETLIBS) 
+check_nt_LDADD = $(NETLIBS)
 check_ntp_LDADD = $(NETLIBS) $(MATHLIBS)
 check_ntp_peer_LDADD = $(NETLIBS) $(MATHLIBS)
 check_nwstat_LDADD = $(NETLIBS)
diff --git a/plugins/check_curl.c b/plugins/check_curl.c
new file mode 100644
index 00000000..2d69b310
--- /dev/null
+++ b/plugins/check_curl.c
@@ -0,0 +1,2335 @@
+/*****************************************************************************
+*
+* Monitoring check_curl plugin
+*
+* License: GPL
+* Copyright (c) 1999-2019 Monitoring Plugins Development Team
+*
+* Description:
+*
+* This file contains the check_curl plugin
+*
+* This plugin tests the HTTP service on the specified host. It can test
+* normal (http) and secure (https) servers, follow redirects, search for
+* strings and regular expressions, check connection times, and report on
+* certificate expiration times.
+*
+* This plugin uses functions from the curl library, see
+* http://curl.haxx.se
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+*
+*****************************************************************************/
+const char *progname = "check_curl";
+
+const char *copyright = "2006-2019";
+const char *email = "devel@monitoring-plugins.org";
+
+#include <ctype.h>
+
+#include "common.h"
+#include "utils.h"
+
+#ifndef LIBCURL_PROTOCOL_HTTP
+#error libcurl compiled without HTTP support, compiling check_curl plugin does not makes a lot of sense
+#endif
+
+#include "curl/curl.h"
+#include "curl/easy.h"
+
+#include "picohttpparser.h"
+
+#include "uriparser/Uri.h"
+
+#include <arpa/inet.h>
+
+#define MAKE_LIBCURL_VERSION(major, minor, patch) ((major)*0x10000 + (minor)*0x100 + (patch))
+
+#define DEFAULT_BUFFER_SIZE 2048
+#define DEFAULT_SERVER_URL "/"
+#define HTTP_EXPECT "HTTP/"
+#define DEFAULT_MAX_REDIRS 15
+#define INET_ADDR_MAX_SIZE INET6_ADDRSTRLEN
+enum {
+  MAX_IPV4_HOSTLENGTH = 255,
+  HTTP_PORT = 80,
+  HTTPS_PORT = 443,
+  MAX_PORT = 65535
+};
+
+enum {
+  STICKY_NONE = 0,
+  STICKY_HOST = 1,
+  STICKY_PORT = 2
+};
+
+enum {
+  FOLLOW_HTTP_CURL = 0,
+  FOLLOW_LIBCURL = 1
+};
+
+/* for buffers for header and body */
+typedef struct {
+  char *buf;
+  size_t buflen;
+  size_t bufsize;
+} curlhelp_write_curlbuf;
+
+/* for buffering the data sent in PUT */
+typedef struct {
+  char *buf;
+  size_t buflen;
+  off_t pos;
+} curlhelp_read_curlbuf;
+
+/* for parsing the HTTP status line */
+typedef struct {
+  int http_major;   /* major version of the protocol, always 1 (HTTP/0.9
+                     * never reached the big internet most likely) */
+  int http_minor;   /* minor version of the protocol, usually 0 or 1 */
+  int http_code;    /* HTTP return code as in RFC 2145 */
+  int http_subcode; /* Microsoft IIS extension, HTTP subcodes, see
+                     * http://support.microsoft.com/kb/318380/en-us */
+  const char *msg;  /* the human readable message */
+  char *first_line; /* a copy of the first line */
+} curlhelp_statusline;
+
+/* to know the underlying SSL library used by libcurl */
+typedef enum curlhelp_ssl_library {
+  CURLHELP_SSL_LIBRARY_UNKNOWN,
+  CURLHELP_SSL_LIBRARY_OPENSSL,
+  CURLHELP_SSL_LIBRARY_LIBRESSL,
+  CURLHELP_SSL_LIBRARY_GNUTLS,
+  CURLHELP_SSL_LIBRARY_NSS
+} curlhelp_ssl_library;
+
+enum {
+  REGS = 2,
+  MAX_RE_SIZE = 256
+};
+#include "regex.h"
+regex_t preg;
+regmatch_t pmatch[REGS];
+char regexp[MAX_RE_SIZE];
+int cflags = REG_NOSUB | REG_EXTENDED | REG_NEWLINE;
+int errcode;
+int invert_regex = 0;
+
+char *server_address = NULL;
+char *host_name = NULL;
+char *server_url = 0;
+char server_ip[DEFAULT_BUFFER_SIZE];
+struct curl_slist *server_ips = NULL;
+int specify_port = FALSE;
+unsigned short server_port = HTTP_PORT;
+unsigned short virtual_port = 0;
+int host_name_length;
+char output_header_search[30] = "";
+char output_string_search[30] = "";
+char *warning_thresholds = NULL;
+char *critical_thresholds = NULL;
+int days_till_exp_warn, days_till_exp_crit;
+thresholds *thlds;
+char user_agent[DEFAULT_BUFFER_SIZE];
+int verbose = 0;
+int show_extended_perfdata = FALSE;
+int min_page_len = 0;
+int max_page_len = 0;
+int redir_depth = 0;
+int max_depth = DEFAULT_MAX_REDIRS;
+char *http_method = NULL;
+char *http_post_data = NULL;
+char *http_content_type = NULL;
+CURL *curl;
+struct curl_slist *header_list = NULL;
+curlhelp_write_curlbuf body_buf;
+curlhelp_write_curlbuf header_buf;
+curlhelp_statusline status_line;
+curlhelp_read_curlbuf put_buf;
+char http_header[DEFAULT_BUFFER_SIZE];
+long code;
+long socket_timeout = DEFAULT_SOCKET_TIMEOUT;
+double total_time;
+double time_connect;
+double time_appconnect;
+double time_headers;
+double time_firstbyte;
+char errbuf[CURL_ERROR_SIZE+1];
+CURLcode res;
+char url[DEFAULT_BUFFER_SIZE];
+char msg[DEFAULT_BUFFER_SIZE];
+char perfstring[DEFAULT_BUFFER_SIZE];
+char header_expect[MAX_INPUT_BUFFER] = "";
+char string_expect[MAX_INPUT_BUFFER] = "";
+char server_expect[MAX_INPUT_BUFFER] = HTTP_EXPECT;
+int server_expect_yn = 0;
+char user_auth[MAX_INPUT_BUFFER] = "";
+char proxy_auth[MAX_INPUT_BUFFER] = "";
+char **http_opt_headers;
+int http_opt_headers_count = 0;
+int display_html = FALSE;
+int onredirect = STATE_OK;
+int followmethod = FOLLOW_HTTP_CURL;
+int followsticky = STICKY_NONE;
+int use_ssl = FALSE;
+int use_sni = TRUE;
+int check_cert = FALSE;
+typedef union {
+  struct curl_slist* to_info;
+  struct curl_certinfo* to_certinfo;
+} cert_ptr_union;
+cert_ptr_union cert_ptr;
+int ssl_version = CURL_SSLVERSION_DEFAULT;
+char *client_cert = NULL;
+char *client_privkey = NULL;
+char *ca_cert = NULL;
+int is_openssl_callback = FALSE;
+#if defined(HAVE_SSL) && defined(USE_OPENSSL)
+X509 *cert = NULL;
+#endif /* defined(HAVE_SSL) && defined(USE_OPENSSL) */
+int no_body = FALSE;
+int maximum_age = -1;
+int address_family = AF_UNSPEC;
+curlhelp_ssl_library ssl_library = CURLHELP_SSL_LIBRARY_UNKNOWN;
+int curl_http_version = CURL_HTTP_VERSION_NONE;
+
+int process_arguments (int, char**);
+void handle_curl_option_return_code (CURLcode res, const char* option);
+int check_http (void);
+void redir (curlhelp_write_curlbuf*);
+char *perfd_time (double microsec);
+char *perfd_time_connect (double microsec);
+char *perfd_time_ssl (double microsec);
+char *perfd_time_firstbyte (double microsec);
+char *perfd_time_headers (double microsec);
+char *perfd_time_transfer (double microsec);
+char *perfd_size (int page_len);
+void print_help (void);
+void print_usage (void);
+void print_curl_version (void);
+int curlhelp_initwritebuffer (curlhelp_write_curlbuf*);
+int curlhelp_buffer_write_callback (void*, size_t , size_t , void*);
+void curlhelp_freewritebuffer (curlhelp_write_curlbuf*);
+int curlhelp_initreadbuffer (curlhelp_read_curlbuf *, const char *, size_t);
+int curlhelp_buffer_read_callback (void *, size_t , size_t , void *);
+void curlhelp_freereadbuffer (curlhelp_read_curlbuf *);
+curlhelp_ssl_library curlhelp_get_ssl_library (CURL*);
+const char* curlhelp_get_ssl_library_string (curlhelp_ssl_library);
+int net_noopenssl_check_certificate (cert_ptr_union*, int, int);
+
+int curlhelp_parse_statusline (const char*, curlhelp_statusline *);
+void curlhelp_free_statusline (curlhelp_statusline *);
+char *get_header_value (const struct phr_header* headers, const size_t nof_headers, const char* header);
+int check_document_dates (const curlhelp_write_curlbuf *, char (*msg)[DEFAULT_BUFFER_SIZE]);
+int get_content_length (const curlhelp_write_curlbuf* header_buf, const curlhelp_write_curlbuf* body_buf);
+
+#if defined(HAVE_SSL) && defined(USE_OPENSSL)
+int np_net_ssl_check_certificate(X509 *certificate, int days_till_exp_warn, int days_till_exp_crit);
+#endif /* defined(HAVE_SSL) && defined(USE_OPENSSL) */
+
+void remove_newlines (char *);
+void test_file (char *);
+
+int
+main (int argc, char **argv)
+{
+  int result = STATE_UNKNOWN;
+
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  /* Parse extra opts if any */
+  argv = np_extra_opts (&argc, argv, progname);
+
+  /* set defaults */
+  snprintf( user_agent, DEFAULT_BUFFER_SIZE, "%s/v%s (monitoring-plugins %s, %s)",
+    progname, NP_VERSION, VERSION, curl_version());
+
+  /* parse arguments */
+  if (process_arguments (argc, argv) == ERROR)
+    usage4 (_("Could not parse arguments"));
+
+  if (display_html == TRUE)
+    printf ("<A HREF=\"%s://%s:%d%s\" target=\"_blank\">",
+      use_ssl ? "https" : "http",
+      host_name ? host_name : server_address,
+      virtual_port ? virtual_port : server_port,
+      server_url);
+
+  result = check_http ();
+  return result;
+}
+
+#ifdef HAVE_SSL
+#ifdef USE_OPENSSL
+
+int verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
+{
+  /* TODO: we get all certificates of the chain, so which ones
+   * should we test?
+   * TODO: is the last certificate always the server certificate?
+   */
+  cert = X509_STORE_CTX_get_current_cert(x509_ctx);
+  return 1;
+}
+
+CURLcode sslctxfun(CURL *curl, SSL_CTX *sslctx, void *parm)
+{
+  SSL_CTX_set_verify(sslctx, SSL_VERIFY_PEER, verify_callback);
+
+  return CURLE_OK;
+}
+
+#endif /* USE_OPENSSL */
+#endif /* HAVE_SSL */
+
+/* Checks if the server 'reply' is one of the expected 'statuscodes' */
+static int
+expected_statuscode (const char *reply, const char *statuscodes)
+{
+  char *expected, *code;
+  int result = 0;
+
+  if ((expected = strdup (statuscodes)) == NULL)
+    die (STATE_UNKNOWN, _("HTTP UNKNOWN - Memory allocation error\n"));
+
+  for (code = strtok (expected, ","); code != NULL; code = strtok (NULL, ","))
+    if (strstr (reply, code) != NULL) {
+      result = 1;
+      break;
+    }
+
+  free (expected);
+  return result;
+}
+
+void
+handle_curl_option_return_code (CURLcode res, const char* option)
+{
+  if (res != CURLE_OK) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("Error while setting cURL option '%s': cURL returned %d - %s"),
+      option, res, curl_easy_strerror(res));
+    die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+  }
+}
+
+int
+check_http (void)
+{
+  int result = STATE_OK;
+  int page_len = 0;
+  int i;
+  char *force_host_header = NULL;
+
+  /* initialize curl */
+  if (curl_global_init (CURL_GLOBAL_DEFAULT) != CURLE_OK)
+    die (STATE_UNKNOWN, "HTTP UNKNOWN - curl_global_init failed\n");
+
+  if ((curl = curl_easy_init()) == NULL)
+    die (STATE_UNKNOWN, "HTTP UNKNOWN - curl_easy_init failed\n");
+
+  if (verbose >= 1)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_VERBOSE, TRUE), "CURLOPT_VERBOSE");
+
+  /* print everything on stdout like check_http would do */
+  handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_STDERR, stdout), "CURLOPT_STDERR");
+
+  /* initialize buffer for body of the answer */
+  if (curlhelp_initwritebuffer(&body_buf) < 0)
+    die (STATE_UNKNOWN, "HTTP CRITICAL - out of memory allocating buffer for body\n");
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, (curl_write_callback)curlhelp_buffer_write_callback), "CURLOPT_WRITEFUNCTION");
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_WRITEDATA, (void *)&body_buf), "CURLOPT_WRITEDATA");
+
+  /* initialize buffer for header of the answer */
+  if (curlhelp_initwritebuffer( &header_buf ) < 0)
+    die (STATE_UNKNOWN, "HTTP CRITICAL - out of memory allocating buffer for header\n" );
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_HEADERFUNCTION, (curl_write_callback)curlhelp_buffer_write_callback), "CURLOPT_HEADERFUNCTION");
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_WRITEHEADER, (void *)&header_buf), "CURLOPT_WRITEHEADER");
+
+  /* set the error buffer */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, errbuf), "CURLOPT_ERRORBUFFER");
+
+  /* set timeouts */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CONNECTTIMEOUT, socket_timeout), "CURLOPT_CONNECTTIMEOUT");
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_TIMEOUT, socket_timeout), "CURLOPT_TIMEOUT");
+
+  // fill dns resolve cache to make curl connect to the given server_address instead of the host_name, only required for ssl, because we use the host_name later on to make SNI happy
+  if(use_ssl && host_name != NULL) {
+      struct curl_slist *host = NULL;
+      char dnscache[DEFAULT_BUFFER_SIZE];
+      snprintf (dnscache, DEFAULT_BUFFER_SIZE, "%s:%d:%s", host_name, server_port, server_address);
+      host = curl_slist_append(NULL, dnscache);
+      curl_easy_setopt(curl, CURLOPT_RESOLVE, host);
+      if (verbose>=1)
+        printf ("* curl CURLOPT_RESOLVE: %s\n", dnscache);
+  }
+
+  /* compose URL: use the address we want to connect to, set Host: header later */
+  snprintf (url, DEFAULT_BUFFER_SIZE, "%s://%s:%d%s",
+      use_ssl ? "https" : "http",
+      use_ssl & host_name != NULL ? host_name : server_address,
+      server_port,
+      server_url
+  );
+
+  if (verbose>=1)
+    printf ("* curl CURLOPT_URL: %s\n", url);
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_URL, url), "CURLOPT_URL");
+
+  /* extract proxy information for legacy proxy https requests */
+  if (!strcmp(http_method, "CONNECT") || strstr(server_url, "http") == server_url) {
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_PROXY, server_address), "CURLOPT_PROXY");
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_PROXYPORT, (long)server_port), "CURLOPT_PROXYPORT");
+    if (verbose>=2)
+      printf ("* curl CURLOPT_PROXY: %s:%d\n", server_address, server_port);
+    http_method = "GET";
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_URL, server_url), "CURLOPT_URL");
+  }
+
+  /* disable body for HEAD request */
+  if (http_method && !strcmp (http_method, "HEAD" )) {
+    no_body = TRUE;
+  }
+
+  /* set HTTP protocol version */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_HTTP_VERSION, curl_http_version), "CURLOPT_HTTP_VERSION");
+
+  /* set HTTP method */
+  if (http_method) {
+    if (!strcmp(http_method, "POST"))
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_POST, 1), "CURLOPT_POST");
+    else if (!strcmp(http_method, "PUT"))
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_UPLOAD, 1), "CURLOPT_UPLOAD");
+    else
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CUSTOMREQUEST, http_method), "CURLOPT_CUSTOMREQUEST");
+  }
+
+  /* check if Host header is explicitly set in options */
+  if (http_opt_headers_count) {
+    for (i = 0; i < http_opt_headers_count ; i++) {
+      if (strncmp(http_opt_headers[i], "Host:", 5) == 0) {
+        force_host_header = http_opt_headers[i];
+      }
+    }
+  }
+
+  /* set hostname (virtual hosts), not needed if CURLOPT_CONNECT_TO is used, but left in anyway */
+  if(host_name != NULL && force_host_header == NULL) {
+    if((virtual_port != HTTP_PORT && !use_ssl) || (virtual_port != HTTPS_PORT && use_ssl)) {
+      snprintf(http_header, DEFAULT_BUFFER_SIZE, "Host: %s:%d", host_name, virtual_port);
+    } else {
+      snprintf(http_header, DEFAULT_BUFFER_SIZE, "Host: %s", host_name);
+    }
+    header_list = curl_slist_append (header_list, http_header);
+  }
+
+  /* always close connection, be nice to servers */
+  snprintf (http_header, DEFAULT_BUFFER_SIZE, "Connection: close");
+  header_list = curl_slist_append (header_list, http_header);
+
+  /* attach additional headers supplied by the user */
+  /* optionally send any other header tag */
+  if (http_opt_headers_count) {
+    for (i = 0; i < http_opt_headers_count ; i++) {
+      header_list = curl_slist_append (header_list, http_opt_headers[i]);
+    }
+    /* This cannot be free'd here because a redirection will then try to access this and segfault */
+    /* Covered in a testcase in tests/check_http.t */
+    /* free(http_opt_headers); */
+  }
+
+  /* set HTTP headers */
+  handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_HTTPHEADER, header_list ), "CURLOPT_HTTPHEADER");
+
+#ifdef LIBCURL_FEATURE_SSL
+
+  /* set SSL version, warn about unsecure or unsupported versions */
+  if (use_ssl) {
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSLVERSION, ssl_version), "CURLOPT_SSLVERSION");
+  }
+
+  /* client certificate and key to present to server (SSL) */
+  if (client_cert)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSLCERT, client_cert), "CURLOPT_SSLCERT");
+  if (client_privkey)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSLKEY, client_privkey), "CURLOPT_SSLKEY");
+  if (ca_cert) {
+    /* per default if we have a CA verify both the peer and the
+     * hostname in the certificate, can be switched off later */
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CAINFO, ca_cert), "CURLOPT_CAINFO");
+    handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_SSL_VERIFYPEER, 1), "CURLOPT_SSL_VERIFYPEER");
+    handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_SSL_VERIFYHOST, 2), "CURLOPT_SSL_VERIFYHOST");
+  } else {
+    /* backward-compatible behaviour, be tolerant in checks
+     * TODO: depending on more options have aspects we want
+     * to be less tolerant about ssl verfications
+     */
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSL_VERIFYPEER, 0), "CURLOPT_SSL_VERIFYPEER");
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSL_VERIFYHOST, 0), "CURLOPT_SSL_VERIFYHOST");
+  }
+
+  /* detect SSL library used by libcurl */
+  ssl_library = curlhelp_get_ssl_library (curl);
+
+  /* try hard to get a stack of certificates to verify against */
+  if (check_cert) {
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1)
+    /* inform curl to report back certificates */
+    switch (ssl_library) {
+      case CURLHELP_SSL_LIBRARY_OPENSSL:
+      case CURLHELP_SSL_LIBRARY_LIBRESSL:
+        /* set callback to extract certificate with OpenSSL context function (works with
+         * OpenSSL-style libraries only!) */
+#ifdef USE_OPENSSL
+        /* libcurl and monitoring plugins built with OpenSSL, good */
+        handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun), "CURLOPT_SSL_CTX_FUNCTION");
+        is_openssl_callback = TRUE;
+#else /* USE_OPENSSL */
+#endif /* USE_OPENSSL */
+        /* libcurl is built with OpenSSL, monitoring plugins, so falling
+         * back to manually extracting certificate information */
+        handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CERTINFO, 1L), "CURLOPT_CERTINFO");
+        break;
+
+      case CURLHELP_SSL_LIBRARY_NSS:
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+        /* NSS: support for CERTINFO is implemented since 7.34.0 */
+        handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CERTINFO, 1L), "CURLOPT_CERTINFO");
+#else /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (libcurl linked with SSL library '%s' is too old)\n", curlhelp_get_ssl_library_string (ssl_library));
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        break;
+
+      case CURLHELP_SSL_LIBRARY_GNUTLS:
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 42, 0)
+        /* GnuTLS: support for CERTINFO is implemented since 7.42.0 */
+        handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CERTINFO, 1L), "CURLOPT_CERTINFO");
+#else /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 42, 0) */
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (libcurl linked with SSL library '%s' is too old)\n", curlhelp_get_ssl_library_string (ssl_library));
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 42, 0) */
+        break;
+
+      case CURLHELP_SSL_LIBRARY_UNKNOWN:
+      default:
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (unknown SSL library '%s', must implement first)\n", curlhelp_get_ssl_library_string (ssl_library));
+        break;
+    }
+#else /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1) */
+    /* old libcurl, our only hope is OpenSSL, otherwise we are out of luck */
+    if (ssl_library == CURLHELP_SSL_LIBRARY_OPENSSL || ssl_library == CURLHELP_SSL_LIBRARY_LIBRESSL)
+      handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun), "CURLOPT_SSL_CTX_FUNCTION");
+    else
+      die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (no CURLOPT_SSL_CTX_FUNCTION, no OpenSSL library or libcurl too old and has no CURLOPT_CERTINFO)\n");
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1) */
+  }
+
+#endif /* LIBCURL_FEATURE_SSL */
+
+  /* set default or user-given user agent identification */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_USERAGENT, user_agent), "CURLOPT_USERAGENT");
+
+  /* proxy-authentication */
+  if (strcmp(proxy_auth, ""))
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_PROXYUSERPWD, proxy_auth), "CURLOPT_PROXYUSERPWD");
+
+  /* authentication */
+  if (strcmp(user_auth, ""))
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_USERPWD, user_auth), "CURLOPT_USERPWD");
+
+  /* TODO: parameter auth method, bitfield of following methods:
+   * CURLAUTH_BASIC (default)
+   * CURLAUTH_DIGEST
+   * CURLAUTH_DIGEST_IE
+   * CURLAUTH_NEGOTIATE
+   * CURLAUTH_NTLM
+   * CURLAUTH_NTLM_WB
+   *
+   * convenience tokens for typical sets of methods:
+   * CURLAUTH_ANYSAFE: most secure, without BASIC
+   * or CURLAUTH_ANY: most secure, even BASIC if necessary
+   *
+   * handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_HTTPAUTH, (long)CURLAUTH_DIGEST ), "CURLOPT_HTTPAUTH");
+   */
+
+  /* handle redirections */
+  if (onredirect == STATE_DEPENDENT) {
+    if( followmethod == FOLLOW_LIBCURL ) {
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1), "CURLOPT_FOLLOWLOCATION");
+
+      /* default -1 is infinite, not good, could lead to zombie plugins!
+         Setting it to one bigger than maximal limit to handle errors nicely below
+       */
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_MAXREDIRS, max_depth+1), "CURLOPT_MAXREDIRS");
+
+      /* for now allow only http and https (we are a http(s) check plugin in the end) */
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 4)
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS), "CURLOPT_REDIRECT_PROTOCOLS");
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 4) */
+
+      /* TODO: handle the following aspects of redirection, make them
+       * command line options too later:
+        CURLOPT_POSTREDIR: method switch
+        CURLINFO_REDIRECT_URL: custom redirect option
+        CURLOPT_REDIRECT_PROTOCOLS: allow people to step outside safe protocols
+        CURLINFO_REDIRECT_COUNT: get the number of redirects, print it, maybe a range option here is nice like for expected page size?
+      */
+    } else {
+      /* old style redirection is handled below */
+    }
+  }
+
+  /* no-body */
+  if (no_body)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_NOBODY, 1), "CURLOPT_NOBODY");
+
+  /* IPv4 or IPv6 forced DNS resolution */
+  if (address_family == AF_UNSPEC)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_WHATEVER), "CURLOPT_IPRESOLVE(CURL_IPRESOLVE_WHATEVER)");
+  else if (address_family == AF_INET)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4), "CURLOPT_IPRESOLVE(CURL_IPRESOLVE_V4)");
+#if defined (USE_IPV6) && defined (LIBCURL_FEATURE_IPV6)
+  else if (address_family == AF_INET6)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V6), "CURLOPT_IPRESOLVE(CURL_IPRESOLVE_V6)");
+#endif
+
+  /* either send http POST data (any data, not only POST)*/
+  if (!strcmp(http_method, "POST") ||!strcmp(http_method, "PUT")) {
+    /* set content of payload for POST and PUT */
+    if (http_content_type) {
+      snprintf (http_header, DEFAULT_BUFFER_SIZE, "Content-Type: %s", http_content_type);
+      header_list = curl_slist_append (header_list, http_header);
+    }
+    /* NULL indicates "HTTP Continue" in libcurl, provide an empty string
+     * in case of no POST/PUT data */
+    if (!http_post_data)
+      http_post_data = "";
+    if (!strcmp(http_method, "POST")) {
+      /* POST method, set payload with CURLOPT_POSTFIELDS */
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_POSTFIELDS, http_post_data), "CURLOPT_POSTFIELDS");
+    } else if (!strcmp(http_method, "PUT")) {
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_READFUNCTION, (curl_read_callback)curlhelp_buffer_read_callback), "CURLOPT_READFUNCTION");
+      curlhelp_initreadbuffer (&put_buf, http_post_data, strlen (http_post_data));
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_READDATA, (void *)&put_buf), "CURLOPT_READDATA");
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_INFILESIZE, (curl_off_t)strlen (http_post_data)), "CURLOPT_INFILESIZE");
+    }
+  }
+
+  /* do the request */
+  res = curl_easy_perform(curl);
+
+  if (verbose>=2 && http_post_data)
+    printf ("**** REQUEST CONTENT ****\n%s\n", http_post_data);
+
+  /* free header and server IP resolve lists, we don't need it anymore */
+  curl_slist_free_all (header_list); header_list = NULL;
+  curl_slist_free_all (server_ips); server_ips = NULL;
+
+  /* Curl errors, result in critical Nagios state */
+  if (res != CURLE_OK) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("Invalid HTTP response received from host on port %d: cURL returned %d - %s"),
+      server_port, res, curl_easy_strerror(res));
+    die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+  }
+
+  /* certificate checks */
+#ifdef LIBCURL_FEATURE_SSL
+  if (use_ssl == TRUE) {
+    if (check_cert == TRUE) {
+      if (is_openssl_callback) {
+#ifdef USE_OPENSSL
+        /* check certificate with OpenSSL functions, curl has been built against OpenSSL
+         * and we actually have OpenSSL in the monitoring tools
+         */
+        result = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
+        return result;
+#else /* USE_OPENSSL */
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates - OpenSSL callback used and not linked against OpenSSL\n");
+#endif /* USE_OPENSSL */
+      } else {
+        int i;
+        struct curl_slist *slist;
+
+        cert_ptr.to_info = NULL;
+        res = curl_easy_getinfo (curl, CURLINFO_CERTINFO, &cert_ptr.to_info);
+        if (!res && cert_ptr.to_info) {
+#ifdef USE_OPENSSL
+          /* We have no OpenSSL in libcurl, but we can use OpenSSL for X509 cert parsing
+           * We only check the first certificate and assume it's the one of the server
+           */
+          const char* raw_cert = NULL;
+          for (i = 0; i < cert_ptr.to_certinfo->num_of_certs; i++) {
+            for (slist = cert_ptr.to_certinfo->certinfo[i]; slist; slist = slist->next) {
+              if (verbose >= 2)
+                printf ("%d ** %s\n", i, slist->data);
+              if (strncmp (slist->data, "Cert:", 5) == 0) {
+                raw_cert = &slist->data[5];
+                goto GOT_FIRST_CERT;
+              }
+            }
+          }
+GOT_FIRST_CERT:
+          if (!raw_cert) {
+            snprintf (msg, DEFAULT_BUFFER_SIZE, _("Cannot retrieve certificates from CERTINFO information - certificate data was empty"));
+            die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+          }
+          BIO* cert_BIO = BIO_new (BIO_s_mem());
+          BIO_write (cert_BIO, raw_cert, strlen(raw_cert));
+          cert = PEM_read_bio_X509 (cert_BIO, NULL, NULL, NULL);
+          if (!cert) {
+            snprintf (msg, DEFAULT_BUFFER_SIZE, _("Cannot read certificate from CERTINFO information - BIO error"));
+            die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+          }
+          BIO_free (cert_BIO);
+          result = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
+          return result;
+#else /* USE_OPENSSL */
+          /* We assume we don't have OpenSSL and np_net_ssl_check_certificate at our disposal,
+           * so we use the libcurl CURLINFO data
+           */
+          result = net_noopenssl_check_certificate(&cert_ptr, days_till_exp_warn, days_till_exp_crit);
+          return result;
+#endif /* USE_OPENSSL */
+        } else {
+          snprintf (msg, DEFAULT_BUFFER_SIZE, _("Cannot retrieve certificates - cURL returned %d - %s"),
+            res, curl_easy_strerror(res));
+          die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+        }
+      }
+    }
+  }
+#endif /* LIBCURL_FEATURE_SSL */
+
+  /* we got the data and we executed the request in a given time, so we can append
+   * performance data to the answer always
+   */
+  handle_curl_option_return_code (curl_easy_getinfo (curl, CURLINFO_TOTAL_TIME, &total_time), "CURLINFO_TOTAL_TIME");
+  page_len = get_content_length(&header_buf, &body_buf);
+  if(show_extended_perfdata) {
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_CONNECT_TIME, &time_connect), "CURLINFO_CONNECT_TIME");
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_APPCONNECT_TIME, &time_appconnect), "CURLINFO_APPCONNECT_TIME");
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_PRETRANSFER_TIME, &time_headers), "CURLINFO_PRETRANSFER_TIME");
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME, &time_firstbyte), "CURLINFO_STARTTRANSFER_TIME");
+    snprintf(perfstring, DEFAULT_BUFFER_SIZE, "%s %s %s %s %s %s %s",
+      perfd_time(total_time),
+      perfd_size(page_len),
+      perfd_time_connect(time_connect),
+      use_ssl == TRUE ? perfd_time_ssl (time_appconnect-time_connect) : "",
+      perfd_time_headers(time_headers - time_appconnect),
+      perfd_time_firstbyte(time_firstbyte - time_headers),
+      perfd_time_transfer(total_time-time_firstbyte)
+    );
+  } else {
+    snprintf(perfstring, DEFAULT_BUFFER_SIZE, "%s %s",
+      perfd_time(total_time),
+      perfd_size(page_len)
+    );
+  }
+
+  /* return a CRITICAL status if we couldn't read any data */
+  if (strlen(header_buf.buf) == 0 && strlen(body_buf.buf) == 0)
+    die (STATE_CRITICAL, _("HTTP CRITICAL - No header received from host\n"));
+
+  /* get status line of answer, check sanity of HTTP code */
+  if (curlhelp_parse_statusline (header_buf.buf, &status_line) < 0) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, "Unparsable status line in %.3g seconds response time|%s\n",
+      total_time, perfstring);
+    die (STATE_CRITICAL, "HTTP CRITICAL HTTP/1.x %ld unknown - %s", code, msg);
+  }
+
+  /* get result code from cURL */
+  handle_curl_option_return_code (curl_easy_getinfo (curl, CURLINFO_RESPONSE_CODE, &code), "CURLINFO_RESPONSE_CODE");
+  if (verbose>=2)
+    printf ("* curl CURLINFO_RESPONSE_CODE is %ld\n", code);
+
+  /* print status line, header, body if verbose */
+  if (verbose >= 2) {
+    printf ("**** HEADER ****\n%s\n**** CONTENT ****\n%s\n", header_buf.buf,
+                (no_body ? "  [[ skipped ]]" : body_buf.buf));
+  }
+
+  /* make sure the status line matches the response we are looking for */
+  if (!expected_statuscode(status_line.first_line, server_expect)) {
+    if (server_port == HTTP_PORT)
+      snprintf(msg, DEFAULT_BUFFER_SIZE, _("Invalid HTTP response received from host: %s\n"), status_line.first_line);
+    else
+      snprintf(msg, DEFAULT_BUFFER_SIZE, _("Invalid HTTP response received from host on port %d: %s\n"), server_port, status_line.first_line);
+    die (STATE_CRITICAL, "HTTP CRITICAL - %s", msg);
+  }
+
+  if( server_expect_yn  )  {
+    snprintf(msg, DEFAULT_BUFFER_SIZE, _("Status line output matched \"%s\" - "), server_expect);
+    if (verbose)
+      printf ("%s\n",msg);
+    result = STATE_OK;
+  }
+  else {
+    /* illegal return codes result in a critical state */
+    if (code >= 600 || code < 100) {
+      die (STATE_CRITICAL, _("HTTP CRITICAL: Invalid Status (%d, %.40s)\n"), status_line.http_code, status_line.msg);
+    /* server errors result in a critical state */
+        } else if (code >= 500) {
+      result = STATE_CRITICAL;
+        /* client errors result in a warning state */
+    } else if (code >= 400) {
+      result = STATE_WARNING;
+    /* check redirected page if specified */
+    } else if (code >= 300) {
+      if (onredirect == STATE_DEPENDENT) {
+        if( followmethod == FOLLOW_LIBCURL ) {
+          code = status_line.http_code;
+        } else {
+          /* old check_http style redirection, if we come
+           * back here, we are in the same status as with
+           * the libcurl method
+           */
+          redir (&header_buf);
+        }
+      } else {
+        /* this is a specific code in the command line to
+         * be returned when a redirection is encoutered
+         */
+      }
+      result = max_state_alt (onredirect, result);
+    /* all other codes are considered ok */
+    } else {
+      result = STATE_OK;
+    }
+  }
+
+  /* libcurl redirection internally, handle error states here */
+  if( followmethod == FOLLOW_LIBCURL ) {
+    handle_curl_option_return_code (curl_easy_getinfo (curl, CURLINFO_REDIRECT_COUNT, &redir_depth), "CURLINFO_REDIRECT_COUNT");
+    if (verbose >= 2)
+      printf(_("* curl LIBINFO_REDIRECT_COUNT is %d\n"), redir_depth);
+    if (redir_depth > max_depth) {
+      snprintf (msg, DEFAULT_BUFFER_SIZE, "maximum redirection depth %d exceeded in libcurl",
+        max_depth);
+      die (STATE_WARNING, "HTTP WARNING - %s", msg);
+    }
+  }
+
+  /* check status codes, set exit status accordingly */
+  if( status_line.http_code != code ) {
+    die (STATE_CRITICAL, _("HTTP CRITICAL HTTP/%d.%d %d %s - different HTTP codes (cUrl has %ld)\n"),
+      status_line.http_major, status_line.http_minor,
+      status_line.http_code, status_line.msg, code);
+  }
+
+  if (maximum_age >= 0) {
+    result = max_state_alt(check_document_dates(&header_buf, &msg), result);
+  }
+
+  /* Page and Header content checks go here */
+
+  if (strlen (header_expect)) {
+    if (!strstr (header_buf.buf, header_expect)) {
+      strncpy(&output_header_search[0],header_expect,sizeof(output_header_search));
+      if(output_header_search[sizeof(output_header_search)-1]!='\0') {
+        bcopy("...",&output_header_search[sizeof(output_header_search)-4],4);
+      }
+      snprintf (msg, DEFAULT_BUFFER_SIZE, _("%sheader '%s' not found on '%s://%s:%d%s', "), msg, output_header_search, use_ssl ? "https" : "http", host_name ? host_name : server_address, server_port, server_url);
+      result = STATE_CRITICAL;
+    }
+  }
+
+  if (strlen (string_expect)) {
+    if (!strstr (body_buf.buf, string_expect)) {
+      strncpy(&output_string_search[0],string_expect,sizeof(output_string_search));
+      if(output_string_search[sizeof(output_string_search)-1]!='\0') {
+        bcopy("...",&output_string_search[sizeof(output_string_search)-4],4);
+      }
+      snprintf (msg, DEFAULT_BUFFER_SIZE, _("%sstring '%s' not found on '%s://%s:%d%s', "), msg, output_string_search, use_ssl ? "https" : "http", host_name ? host_name : server_address, server_port, server_url);
+      result = STATE_CRITICAL;
+    }
+  }
+
+  if (strlen (regexp)) {
+    errcode = regexec (&preg, body_buf.buf, REGS, pmatch, 0);
+    if ((errcode == 0 && invert_regex == 0) || (errcode == REG_NOMATCH && invert_regex == 1)) {
+      /* OK - No-op to avoid changing the logic around it */
+      result = max_state_alt(STATE_OK, result);
+    }
+    else if ((errcode == REG_NOMATCH && invert_regex == 0) || (errcode == 0 && invert_regex == 1)) {
+      if (invert_regex == 0)
+        snprintf (msg, DEFAULT_BUFFER_SIZE, _("%spattern not found, "), msg);
+      else
+        snprintf (msg, DEFAULT_BUFFER_SIZE, _("%spattern found, "), msg);
+      result = STATE_CRITICAL;
+    }
+    else {
+      regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
+      snprintf (msg, DEFAULT_BUFFER_SIZE, _("%sExecute Error: %s, "), msg, errbuf);
+      result = STATE_UNKNOWN;
+    }
+  }
+
+  /* make sure the page is of an appropriate size */
+  if ((max_page_len > 0) && (page_len > max_page_len)) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("%spage size %d too large, "), msg, page_len);
+    result = max_state_alt(STATE_WARNING, result);
+  } else if ((min_page_len > 0) && (page_len < min_page_len)) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("%spage size %d too small, "), msg, page_len);
+    result = max_state_alt(STATE_WARNING, result);
+  }
+
+  /* -w, -c: check warning and critical level */
+  result = max_state_alt(get_status(total_time, thlds), result);
+
+  /* Cut-off trailing characters */
+  if(msg[strlen(msg)-2] == ',')
+    msg[strlen(msg)-2] = '\0';
+  else
+    msg[strlen(msg)-3] = '\0';
+
+  /* TODO: separate _() msg and status code: die (result, "HTTP %s: %s\n", state_text(result), msg); */
+  die (result, "HTTP %s: HTTP/%d.%d %d %s%s%s - %d bytes in %.3f second response time %s|%s\n",
+    state_text(result), status_line.http_major, status_line.http_minor,
+    status_line.http_code, status_line.msg,
+    strlen(msg) > 0 ? " - " : "",
+    msg, page_len, total_time,
+    (display_html ? "</A>" : ""),
+    perfstring);
+
+  /* proper cleanup after die? */
+  curlhelp_free_statusline(&status_line);
+  curl_easy_cleanup (curl);
+  curl_global_cleanup ();
+  curlhelp_freewritebuffer (&body_buf);
+  curlhelp_freewritebuffer (&header_buf);
+  if (!strcmp (http_method, "PUT")) {
+    curlhelp_freereadbuffer (&put_buf);
+  }
+
+  return result;
+}
+
+int
+uri_strcmp (const UriTextRangeA range, const char* s)
+{
+  if (!range.first) return -1;
+  if (range.afterLast - range.first < strlen (s)) return -1;
+  return strncmp (s, range.first, min( range.afterLast - range.first, strlen (s)));
+}
+
+char*
+uri_string (const UriTextRangeA range, char* buf, size_t buflen)
+{
+  if (!range.first) return "(null)";
+  strncpy (buf, range.first, max (buflen, range.afterLast - range.first));
+  buf[max (buflen, range.afterLast - range.first)] = '\0';
+  buf[range.afterLast - range.first] = '\0';
+  return buf;
+}
+
+void
+redir (curlhelp_write_curlbuf* header_buf)
+{
+  char *location = NULL;
+  curlhelp_statusline status_line;
+  struct phr_header headers[255];
+  size_t nof_headers = 255;
+  size_t msglen;
+  char buf[DEFAULT_BUFFER_SIZE];
+  char ipstr[INET_ADDR_MAX_SIZE];
+  int new_port;
+  char *new_host;
+  char *new_url;
+
+  int res = phr_parse_response (header_buf->buf, header_buf->buflen,
+    &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
+    headers, &nof_headers, 0);
+
+  location = get_header_value (headers, nof_headers, "location");
+
+  if (verbose >= 2)
+    printf(_("* Seen redirect location %s\n"), location);
+
+  if (++redir_depth > max_depth)
+    die (STATE_WARNING,
+         _("HTTP WARNING - maximum redirection depth %d exceeded - %s%s\n"),
+         max_depth, location, (display_html ? "</A>" : ""));
+
+  UriParserStateA state;
+  UriUriA uri;
+  state.uri = &uri;
+  if (uriParseUriA (&state, location) != URI_SUCCESS) {
+    if (state.errorCode == URI_ERROR_SYNTAX) {
+      die (STATE_UNKNOWN,
+           _("HTTP UNKNOWN - Could not parse redirect location '%s'%s\n"),
+           location, (display_html ? "</A>" : ""));
+    } else if (state.errorCode == URI_ERROR_MALLOC) {
+      die (STATE_UNKNOWN, _("HTTP UNKNOWN - Could not allocate URL\n"));
+    }
+  }
+
+  if (verbose >= 2) {
+    printf (_("** scheme: %s\n"),
+      uri_string (uri.scheme, buf, DEFAULT_BUFFER_SIZE));
+    printf (_("** host: %s\n"),
+      uri_string (uri.hostText, buf, DEFAULT_BUFFER_SIZE));
+    printf (_("** port: %s\n"),
+      uri_string (uri.portText, buf, DEFAULT_BUFFER_SIZE));
+    if (uri.hostData.ip4) {
+      inet_ntop (AF_INET, uri.hostData.ip4->data, ipstr, sizeof (ipstr));
+      printf (_("** IPv4: %s\n"), ipstr);
+    }
+    if (uri.hostData.ip6) {
+      inet_ntop (AF_INET, uri.hostData.ip6->data, ipstr, sizeof (ipstr));
+      printf (_("** IPv6: %s\n"), ipstr);
+    }
+    if (uri.pathHead) {
+      printf (_("** path: "));
+      const UriPathSegmentA* p = uri.pathHead;
+      for (; p; p = p->next) {
+        printf ("/%s", uri_string (p->text, buf, DEFAULT_BUFFER_SIZE));
+      }
+      puts ("");
+    }
+    if (uri.query.first) {
+      printf (_("** query: %s\n"),
+      uri_string (uri.query, buf, DEFAULT_BUFFER_SIZE));
+    }
+    if (uri.fragment.first) {
+      printf (_("** fragment: %s\n"),
+      uri_string (uri.fragment, buf, DEFAULT_BUFFER_SIZE));
+    }
+  }
+
+  use_ssl = !uri_strcmp (uri.scheme, "https");
+
+  /* we do a sloppy test here only, because uriparser would have failed
+   * above, if the port would be invalid, we just check for MAX_PORT
+   */
+  if (uri.portText.first) {
+    new_port = atoi (uri_string (uri.portText, buf, DEFAULT_BUFFER_SIZE));
+  } else {
+    new_port = HTTP_PORT;
+    if (use_ssl)
+      new_port = HTTPS_PORT;
+  }
+  if (new_port > MAX_PORT)
+    die (STATE_UNKNOWN,
+         _("HTTP UNKNOWN - Redirection to port above %d - %s%s\n"),
+         MAX_PORT, location, display_html ? "</A>" : "");
+
+  /* by RFC 7231 relative URLs in Location should be taken relative to
+   * the original URL, so wy try to form a new absolute URL here
+   */
+  if (!uri.scheme.first && !uri.hostText.first) {
+    new_host = strdup (host_name ? host_name : server_address);
+  } else {
+    new_host = strdup (uri_string (uri.hostText, buf, DEFAULT_BUFFER_SIZE));
+  }
+
+  /* compose new path */
+  /* TODO: handle fragments and query part of URL */
+  new_url = (char *)calloc( 1, DEFAULT_BUFFER_SIZE);
+  if (uri.pathHead) {
+    const UriPathSegmentA* p = uri.pathHead;
+    for (; p; p = p->next) {
+      strncat (new_url, "/", DEFAULT_BUFFER_SIZE);
+      strncat (new_url, uri_string (p->text, buf, DEFAULT_BUFFER_SIZE), DEFAULT_BUFFER_SIZE);
+    }
+  }
+
+  if (server_port==new_port &&
+      !strncmp(server_address, new_host, MAX_IPV4_HOSTLENGTH) &&
+      (host_name && !strncmp(host_name, new_host, MAX_IPV4_HOSTLENGTH)) &&
+      !strcmp(server_url, new_url))
+    die (STATE_WARNING,
+         _("HTTP WARNING - redirection creates an infinite loop - %s://%s:%d%s%s\n"),
+         use_ssl ? "https" : "http", new_host, new_port, new_url, (display_html ? "</A>" : ""));
+
+  /* set new values for redirected request */
+
+  if (!(followsticky & STICKY_HOST)) {
+    free (server_address);
+    server_address = strndup (new_host, MAX_IPV4_HOSTLENGTH);
+  }
+  if (!(followsticky & STICKY_PORT)) {
+    server_port = (unsigned short)new_port;
+  }
+
+  free (host_name);
+  host_name = strndup (new_host, MAX_IPV4_HOSTLENGTH);
+
+  /* reset virtual port */
+  virtual_port = server_port;
+
+  free(new_host);
+  free (server_url);
+  server_url = new_url;
+
+  uriFreeUriMembersA (&uri);
+
+  if (verbose)
+    printf (_("Redirection to %s://%s:%d%s\n"), use_ssl ? "https" : "http",
+            host_name ? host_name : server_address, server_port, server_url);
+
+  /* TODO: the hash component MUST be taken from the original URL and
+   * attached to the URL in Location
+   */
+
+  check_http ();
+}
+
+/* check whether a file exists */
+void
+test_file (char *path)
+{
+  if (access(path, R_OK) == 0)
+    return;
+  usage2 (_("file does not exist or is not readable"), path);
+}
+
+int
+process_arguments (int argc, char **argv)
+{
+  char *p;
+  int c = 1;
+  char *temp;
+
+  enum {
+    INVERT_REGEX = CHAR_MAX + 1,
+    SNI_OPTION,
+    CA_CERT_OPTION,
+    HTTP_VERSION_OPTION
+  };
+
+  int option = 0;
+  int got_plus = 0;
+  static struct option longopts[] = {
+    STD_LONG_OPTS,
+    {"link", no_argument, 0, 'L'},
+    {"nohtml", no_argument, 0, 'n'},
+    {"ssl", optional_argument, 0, 'S'},
+    {"sni", no_argument, 0, SNI_OPTION},
+    {"post", required_argument, 0, 'P'},
+    {"method", required_argument, 0, 'j'},
+    {"IP-address", required_argument, 0, 'I'},
+    {"url", required_argument, 0, 'u'},
+    {"port", required_argument, 0, 'p'},
+    {"authorization", required_argument, 0, 'a'},
+    {"proxy-authorization", required_argument, 0, 'b'},
+    {"header-string", required_argument, 0, 'd'},
+    {"string", required_argument, 0, 's'},
+    {"expect", required_argument, 0, 'e'},
+    {"regex", required_argument, 0, 'r'},
+    {"ereg", required_argument, 0, 'r'},
+    {"eregi", required_argument, 0, 'R'},
+    {"linespan", no_argument, 0, 'l'},
+    {"onredirect", required_argument, 0, 'f'},
+    {"certificate", required_argument, 0, 'C'},
+    {"client-cert", required_argument, 0, 'J'},
+    {"private-key", required_argument, 0, 'K'},
+    {"ca-cert", required_argument, 0, CA_CERT_OPTION},
+    {"useragent", required_argument, 0, 'A'},
+    {"header", required_argument, 0, 'k'},
+    {"no-body", no_argument, 0, 'N'},
+    {"max-age", required_argument, 0, 'M'},
+    {"content-type", required_argument, 0, 'T'},
+    {"pagesize", required_argument, 0, 'm'},
+    {"invert-regex", no_argument, NULL, INVERT_REGEX},
+    {"use-ipv4", no_argument, 0, '4'},
+    {"use-ipv6", no_argument, 0, '6'},
+    {"extended-perfdata", no_argument, 0, 'E'},
+    {"http-version", required_argument, 0, HTTP_VERSION_OPTION},
+    {0, 0, 0, 0}
+  };
+
+  if (argc < 2)
+    return ERROR;
+
+  /* support check_http compatible arguments */
+  for (c = 1; c < argc; c++) {
+    if (strcmp ("-to", argv[c]) == 0)
+      strcpy (argv[c], "-t");
+    if (strcmp ("-hn", argv[c]) == 0)
+      strcpy (argv[c], "-H");
+    if (strcmp ("-wt", argv[c]) == 0)
+      strcpy (argv[c], "-w");
+    if (strcmp ("-ct", argv[c]) == 0)
+      strcpy (argv[c], "-c");
+    if (strcmp ("-nohtml", argv[c]) == 0)
+      strcpy (argv[c], "-n");
+  }
+
+  server_url = strdup(DEFAULT_SERVER_URL);
+
+  while (1) {
+    c = getopt_long (argc, argv, "Vvh46t:c:w:A:k:H:P:j:T:I:a:b:d:e:p:s:R:r:u:f:C:J:K:nlLS::m:M:NE", longopts, &option);
+    if (c == -1 || c == EOF || c == 1)
+      break;
+
+    switch (c) {
+    case 'h':
+      print_help();
+      exit(STATE_UNKNOWN);
+      break;
+    case 'V':
+      print_revision(progname, NP_VERSION);
+      print_curl_version();
+      exit(STATE_UNKNOWN);
+      break;
+    case 'v':
+      verbose++;
+      break;
+    case 't': /* timeout period */
+      if (!is_intnonneg (optarg))
+        usage2 (_("Timeout interval must be a positive integer"), optarg);
+      else
+        socket_timeout = (int)strtol (optarg, NULL, 10);
+      break;
+    case 'c': /* critical time threshold */
+      critical_thresholds = optarg;
+      break;
+    case 'w': /* warning time threshold */
+      warning_thresholds = optarg;
+      break;
+    case 'H': /* virtual host */
+      host_name = strdup (optarg);
+      if (host_name[0] == '[') {
+        if ((p = strstr (host_name, "]:")) != NULL) { /* [IPv6]:port */
+          virtual_port = atoi (p + 2);
+          /* cut off the port */
+          host_name_length = strlen (host_name) - strlen (p) - 1;
+          free (host_name);
+          host_name = strndup (optarg, host_name_length);
+	}
+      } else if ((p = strchr (host_name, ':')) != NULL
+                 && strchr (++p, ':') == NULL) { /* IPv4:port or host:port */
+          virtual_port = atoi (p);
+          /* cut off the port */
+          host_name_length = strlen (host_name) - strlen (p) - 1;
+          free (host_name);
+          host_name = strndup (optarg, host_name_length);
+        }
+      break;
+    case 'I': /* internet address */
+      server_address = strdup (optarg);
+      break;
+    case 'u': /* URL path */
+      server_url = strdup (optarg);
+      break;
+    case 'p': /* Server port */
+      if (!is_intnonneg (optarg))
+        usage2 (_("Invalid port number, expecting a non-negative number"), optarg);
+      else {
+        if( strtol(optarg, NULL, 10) > MAX_PORT)
+          usage2 (_("Invalid port number, supplied port number is too big"), optarg);
+        server_port = (unsigned short)strtol(optarg, NULL, 10);
+        specify_port = TRUE;
+      }
+      break;
+    case 'a': /* authorization info */
+      strncpy (user_auth, optarg, MAX_INPUT_BUFFER - 1);
+      user_auth[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 'b': /* proxy-authorization info */
+      strncpy (proxy_auth, optarg, MAX_INPUT_BUFFER - 1);
+      proxy_auth[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 'P': /* HTTP POST data in URL encoded format; ignored if settings already */
+      if (! http_post_data)
+        http_post_data = strdup (optarg);
+      if (! http_method)
+        http_method = strdup("POST");
+      break;
+    case 'j': /* Set HTTP method */
+      if (http_method)
+        free(http_method);
+      http_method = strdup (optarg);
+      break;
+    case 'A': /* useragent */
+      strncpy (user_agent, optarg, DEFAULT_BUFFER_SIZE);
+      user_agent[DEFAULT_BUFFER_SIZE-1] = '\0';
+      break;
+    case 'k': /* Additional headers */
+      if (http_opt_headers_count == 0)
+        http_opt_headers = malloc (sizeof (char *) * (++http_opt_headers_count));
+      else
+        http_opt_headers = realloc (http_opt_headers, sizeof (char *) * (++http_opt_headers_count));
+      http_opt_headers[http_opt_headers_count - 1] = optarg;
+      break;
+    case 'L': /* show html link */
+      display_html = TRUE;
+      break;
+    case 'n': /* do not show html link */
+      display_html = FALSE;
+      break;
+    case 'C': /* Check SSL cert validity */
+#ifdef LIBCURL_FEATURE_SSL
+      if ((temp=strchr(optarg,','))!=NULL) {
+        *temp='\0';
+        if (!is_intnonneg (optarg))
+          usage2 (_("Invalid certificate expiration period"), optarg);
+        days_till_exp_warn = atoi(optarg);
+        *temp=',';
+        temp++;
+        if (!is_intnonneg (temp))
+          usage2 (_("Invalid certificate expiration period"), temp);
+        days_till_exp_crit = atoi (temp);
+      }
+      else {
+        days_till_exp_crit=0;
+        if (!is_intnonneg (optarg))
+          usage2 (_("Invalid certificate expiration period"), optarg);
+        days_till_exp_warn = atoi (optarg);
+      }
+      check_cert = TRUE;
+      goto enable_ssl;
+#endif
+    case 'J': /* use client certificate */
+#ifdef LIBCURL_FEATURE_SSL
+      test_file(optarg);
+      client_cert = optarg;
+      goto enable_ssl;
+#endif
+    case 'K': /* use client private key */
+#ifdef LIBCURL_FEATURE_SSL
+      test_file(optarg);
+      client_privkey = optarg;
+      goto enable_ssl;
+#endif
+#ifdef LIBCURL_FEATURE_SSL
+    case CA_CERT_OPTION: /* use CA chain file */
+      test_file(optarg);
+      ca_cert = optarg;
+      goto enable_ssl;
+#endif
+    case 'S': /* use SSL */
+#ifdef LIBCURL_FEATURE_SSL
+    enable_ssl:
+      use_ssl = TRUE;
+      /* ssl_version initialized to CURL_SSLVERSION_DEFAULT as a default.
+       * Only set if it's non-zero.  This helps when we include multiple
+       * parameters, like -S and -C combinations */
+      ssl_version = CURL_SSLVERSION_DEFAULT;
+      if (c=='S' && optarg != NULL) {
+        char *plus_ptr = strchr(optarg, '+');
+        if (plus_ptr) {
+          got_plus = 1;
+          *plus_ptr = '\0';
+        }
+
+        if (optarg[0] == '2')
+          ssl_version = CURL_SSLVERSION_SSLv2;
+        else if (optarg[0] == '3')
+          ssl_version = CURL_SSLVERSION_SSLv3;
+        else if (!strcmp (optarg, "1") || !strcmp (optarg, "1.0"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_0;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        else if (!strcmp (optarg, "1.1"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_1;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        else if (!strcmp (optarg, "1.2"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_2;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        else if (!strcmp (optarg, "1.3"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 52, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_3;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 52, 0) */
+        else
+          usage4 (_("Invalid option - Valid SSL/TLS versions: 2, 3, 1, 1.1, 1.2 (with optional '+' suffix)"));
+      }
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 54, 0)
+      if (got_plus) {
+        switch (ssl_version) {
+          case CURL_SSLVERSION_TLSv1_3:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_3;
+            break;
+          case CURL_SSLVERSION_TLSv1_2:
+          case CURL_SSLVERSION_TLSv1_1:
+          case CURL_SSLVERSION_TLSv1_0:
+            ssl_version |= CURL_SSLVERSION_MAX_DEFAULT;
+            break;
+        }
+      } else {
+        switch (ssl_version) {
+          case CURL_SSLVERSION_TLSv1_3:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_3;
+            break;
+          case CURL_SSLVERSION_TLSv1_2:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_2;
+            break;
+          case CURL_SSLVERSION_TLSv1_1:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_1;
+            break;
+          case CURL_SSLVERSION_TLSv1_0:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_0;
+            break;
+        }
+      }
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 54, 0) */
+      if (verbose >= 2)
+        printf(_("* Set SSL/TLS version to %d\n"), ssl_version);
+      if (specify_port == FALSE)
+        server_port = HTTPS_PORT;
+      break;
+#else /* LIBCURL_FEATURE_SSL */
+      /* -C -J and -K fall through to here without SSL */
+      usage4 (_("Invalid option - SSL is not available"));
+      break;
+    case SNI_OPTION: /* --sni is parsed, but ignored, the default is TRUE with libcurl */
+      use_sni = TRUE;
+      break;
+#endif /* LIBCURL_FEATURE_SSL */
+    case 'f': /* onredirect */
+      if (!strcmp (optarg, "ok"))
+        onredirect = STATE_OK;
+      else if (!strcmp (optarg, "warning"))
+        onredirect = STATE_WARNING;
+      else if (!strcmp (optarg, "critical"))
+        onredirect = STATE_CRITICAL;
+      else if (!strcmp (optarg, "unknown"))
+        onredirect = STATE_UNKNOWN;
+      else if (!strcmp (optarg, "follow"))
+        onredirect = STATE_DEPENDENT;
+      else if (!strcmp (optarg, "stickyport"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_HTTP_CURL, followsticky = STICKY_HOST|STICKY_PORT;
+      else if (!strcmp (optarg, "sticky"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_HTTP_CURL, followsticky = STICKY_HOST;
+      else if (!strcmp (optarg, "follow"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_HTTP_CURL, followsticky = STICKY_NONE;
+      else if (!strcmp (optarg, "curl"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_LIBCURL;
+      else usage2 (_("Invalid onredirect option"), optarg);
+      if (verbose >= 2)
+        printf(_("* Following redirects set to %s\n"), state_text(onredirect));
+      break;
+    case 'd': /* string or substring */
+      strncpy (header_expect, optarg, MAX_INPUT_BUFFER - 1);
+      header_expect[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 's': /* string or substring */
+      strncpy (string_expect, optarg, MAX_INPUT_BUFFER - 1);
+      string_expect[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 'e': /* string or substring */
+      strncpy (server_expect, optarg, MAX_INPUT_BUFFER - 1);
+      server_expect[MAX_INPUT_BUFFER - 1] = 0;
+      server_expect_yn = 1;
+      break;
+    case 'T': /* Content-type */
+      http_content_type = strdup (optarg);
+     break;
+    case 'l': /* linespan */
+      cflags &= ~REG_NEWLINE;
+      break;
+    case 'R': /* regex */
+      cflags |= REG_ICASE;
+    case 'r': /* regex */
+      strncpy (regexp, optarg, MAX_RE_SIZE - 1);
+      regexp[MAX_RE_SIZE - 1] = 0;
+      errcode = regcomp (&preg, regexp, cflags);
+      if (errcode != 0) {
+        (void) regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
+        printf (_("Could Not Compile Regular Expression: %s"), errbuf);
+        return ERROR;
+      }
+      break;
+    case INVERT_REGEX:
+      invert_regex = 1;
+      break;
+    case '4':
+      address_family = AF_INET;
+      break;
+    case '6':
+#if defined (USE_IPV6) && defined (LIBCURL_FEATURE_IPV6)
+      address_family = AF_INET6;
+#else
+      usage4 (_("IPv6 support not available"));
+#endif
+      break;
+    case 'm': /* min_page_length */
+      {
+      char *tmp;
+      if (strchr(optarg, ':') != (char *)NULL) {
+        /* range, so get two values, min:max */
+        tmp = strtok(optarg, ":");
+        if (tmp == NULL) {
+          printf("Bad format: try \"-m min:max\"\n");
+          exit (STATE_WARNING);
+        } else
+          min_page_len = atoi(tmp);
+
+        tmp = strtok(NULL, ":");
+        if (tmp == NULL) {
+          printf("Bad format: try \"-m min:max\"\n");
+          exit (STATE_WARNING);
+        } else
+          max_page_len = atoi(tmp);
+      } else
+        min_page_len = atoi (optarg);
+      break;
+      }
+    case 'N': /* no-body */
+      no_body = TRUE;
+      break;
+    case 'M': /* max-age */
+    {
+      int L = strlen(optarg);
+      if (L && optarg[L-1] == 'm')
+        maximum_age = atoi (optarg) * 60;
+      else if (L && optarg[L-1] == 'h')
+        maximum_age = atoi (optarg) * 60 * 60;
+      else if (L && optarg[L-1] == 'd')
+        maximum_age = atoi (optarg) * 60 * 60 * 24;
+      else if (L && (optarg[L-1] == 's' ||
+                     isdigit (optarg[L-1])))
+        maximum_age = atoi (optarg);
+      else {
+        fprintf (stderr, "unparsable max-age: %s\n", optarg);
+        exit (STATE_WARNING);
+      }
+      if (verbose >= 2)
+        printf ("* Maximal age of document set to %d seconds\n", maximum_age);
+    }
+    break;
+    case 'E': /* show extended perfdata */
+      show_extended_perfdata = TRUE;
+      break;
+    case HTTP_VERSION_OPTION:
+      curl_http_version = CURL_HTTP_VERSION_NONE;
+      if (strcmp (optarg, "1.0") == 0) {
+        curl_http_version = CURL_HTTP_VERSION_1_0;
+      } else if (strcmp (optarg, "1.1") == 0) {
+        curl_http_version = CURL_HTTP_VERSION_1_1;
+      } else if ((strcmp (optarg, "2.0") == 0) || (strcmp (optarg, "2") == 0)) {
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 33, 0)
+        curl_http_version = CURL_HTTP_VERSION_2_0;
+#else
+        curl_http_version = CURL_HTTP_VERSION_NONE;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 33, 0) */
+      } else {
+        fprintf (stderr, "unkown http-version parameter: %s\n", optarg);
+        exit (STATE_WARNING);
+      }
+      break;
+    case '?':
+      /* print short usage statement if args not parsable */
+      usage5 ();
+      break;
+    }
+  }
+
+  c = optind;
+
+  if (server_address == NULL && c < argc)
+    server_address = strdup (argv[c++]);
+
+  if (host_name == NULL && c < argc)
+    host_name = strdup (argv[c++]);
+
+  if (server_address == NULL) {
+    if (host_name == NULL)
+      usage4 (_("You must specify a server address or host name"));
+    else
+      server_address = strdup (host_name);
+  }
+
+  set_thresholds(&thlds, warning_thresholds, critical_thresholds);
+
+  if (critical_thresholds && thlds->critical->end>(double)socket_timeout)
+    socket_timeout = (int)thlds->critical->end + 1;
+  if (verbose >= 2)
+    printf ("* Socket timeout set to %ld seconds\n", socket_timeout);
+
+  if (http_method == NULL)
+    http_method = strdup ("GET");
+
+  if (client_cert && !client_privkey)
+    usage4 (_("If you use a client certificate you must also specify a private key file"));
+
+  if (virtual_port == 0)
+    virtual_port = server_port;
+  else {
+    if ((use_ssl && server_port == HTTPS_PORT) || (!use_ssl && server_port == HTTP_PORT))
+      if(specify_port == FALSE)
+        server_port = virtual_port;
+  }
+
+  return TRUE;
+}
+
+char *perfd_time (double elapsed_time)
+{
+  return fperfdata ("time", elapsed_time, "s",
+            thlds->warning?TRUE:FALSE, thlds->warning?thlds->warning->end:0,
+            thlds->critical?TRUE:FALSE, thlds->critical?thlds->critical->end:0,
+                   TRUE, 0, TRUE, socket_timeout);
+}
+
+char *perfd_time_connect (double elapsed_time_connect)
+{
+  return fperfdata ("time_connect", elapsed_time_connect, "s", FALSE, 0, FALSE, 0, FALSE, 0, TRUE, socket_timeout);
+}
+
+char *perfd_time_ssl (double elapsed_time_ssl)
+{
+  return fperfdata ("time_ssl", elapsed_time_ssl, "s", FALSE, 0, FALSE, 0, FALSE, 0, TRUE, socket_timeout);
+}
+
+char *perfd_time_headers (double elapsed_time_headers)
+{
+  return fperfdata ("time_headers", elapsed_time_headers, "s", FALSE, 0, FALSE, 0, FALSE, 0, TRUE, socket_timeout);
+}
+
+char *perfd_time_firstbyte (double elapsed_time_firstbyte)
+{
+  return fperfdata ("time_firstbyte", elapsed_time_firstbyte, "s", FALSE, 0, FALSE, 0, FALSE, 0, TRUE, socket_timeout);
+}
+
+char *perfd_time_transfer (double elapsed_time_transfer)
+{
+  return fperfdata ("time_transfer", elapsed_time_transfer, "s", FALSE, 0, FALSE, 0, FALSE, 0, TRUE, socket_timeout);
+}
+
+char *perfd_size (int page_len)
+{
+  return perfdata ("size", page_len, "B",
+            (min_page_len>0?TRUE:FALSE), min_page_len,
+            (min_page_len>0?TRUE:FALSE), 0,
+            TRUE, 0, FALSE, 0);
+}
+
+void
+print_help (void)
+{
+  print_revision (progname, NP_VERSION);
+
+  printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
+  printf (COPYRIGHT, copyright, email);
+
+  printf ("%s\n", _("This plugin tests the HTTP service on the specified host. It can test"));
+  printf ("%s\n", _("normal (http) and secure (https) servers, follow redirects, search for"));
+  printf ("%s\n", _("strings and regular expressions, check connection times, and report on"));
+  printf ("%s\n", _("certificate expiration times."));
+  printf ("\n");
+  printf ("%s\n", _("It makes use of libcurl to do so. It tries to be as compatible to check_http"));
+  printf ("%s\n", _("as possible."));
+
+  printf ("\n\n");
+
+  print_usage ();
+
+  printf (_("NOTE: One or both of -H and -I must be specified"));
+
+  printf ("\n");
+
+  printf (UT_HELP_VRSN);
+  printf (UT_EXTRA_OPTS);
+
+  printf (" %s\n", "-H, --hostname=ADDRESS");
+  printf ("    %s\n", _("Host name argument for servers using host headers (virtual host)"));
+  printf ("    %s\n", _("Append a port to include it in the header (eg: example.com:5000)"));
+  printf (" %s\n", "-I, --IP-address=ADDRESS");
+  printf ("    %s\n", _("IP address or name (use numeric address if possible to bypass DNS lookup)."));
+  printf (" %s\n", "-p, --port=INTEGER");
+  printf ("    %s", _("Port number (default: "));
+  printf ("%d)\n", HTTP_PORT);
+
+  printf (UT_IPv46);
+
+#ifdef LIBCURL_FEATURE_SSL
+  printf (" %s\n", "-S, --ssl=VERSION[+]");
+  printf ("    %s\n", _("Connect via SSL. Port defaults to 443. VERSION is optional, and prevents"));
+  printf ("    %s\n", _("auto-negotiation (2 = SSLv2, 3 = SSLv3, 1 = TLSv1, 1.1 = TLSv1.1,"));
+  printf ("    %s\n", _("1.2 = TLSv1.2). With a '+' suffix, newer versions are also accepted."));
+  printf ("    %s\n", _("Note: SSLv2 and SSLv3 are deprecated and are usually disabled in libcurl"));
+  printf (" %s\n", "--sni");
+  printf ("    %s\n", _("Enable SSL/TLS hostname extension support (SNI)"));
+#if LIBCURL_VERSION_NUM >= 0x071801
+  printf ("    %s\n", _("Note: --sni is the default in libcurl as SSLv2 and SSLV3 are deprecated and"));
+  printf ("    %s\n", _("      SNI only really works since TLSv1.0"));
+#else
+  printf ("    %s\n", _("Note: SNI is not supported in libcurl before 7.18.1"));
+#endif
+  printf (" %s\n", "-C, --certificate=INTEGER[,INTEGER]");
+  printf ("    %s\n", _("Minimum number of days a certificate has to be valid. Port defaults to 443"));
+  printf ("    %s\n", _("(when this option is used the URL is not checked.)"));
+  printf (" %s\n", "-J, --client-cert=FILE");
+  printf ("   %s\n", _("Name of file that contains the client certificate (PEM format)"));
+  printf ("   %s\n", _("to be used in establishing the SSL session"));
+  printf (" %s\n", "-K, --private-key=FILE");
+  printf ("   %s\n", _("Name of file containing the private key (PEM format)"));
+  printf ("   %s\n", _("matching the client certificate"));
+  printf (" %s\n", "--ca-cert=FILE");
+  printf ("   %s\n", _("CA certificate file to verify peer against"));
+#endif
+
+  printf (" %s\n", "-e, --expect=STRING");
+  printf ("    %s\n", _("Comma-delimited list of strings, at least one of them is expected in"));
+  printf ("    %s", _("the first (status) line of the server response (default: "));
+  printf ("%s)\n", HTTP_EXPECT);
+  printf ("    %s\n", _("If specified skips all other status line logic (ex: 3xx, 4xx, 5xx processing)"));
+  printf (" %s\n", "-d, --header-string=STRING");
+  printf ("    %s\n", _("String to expect in the response headers"));
+  printf (" %s\n", "-s, --string=STRING");
+  printf ("    %s\n", _("String to expect in the content"));
+  printf (" %s\n", "-u, --url=PATH");
+  printf ("    %s\n", _("URL to GET or POST (default: /)"));
+  printf (" %s\n", "-P, --post=STRING");
+  printf ("    %s\n", _("URL encoded http POST data"));
+  printf (" %s\n", "-j, --method=STRING  (for example: HEAD, OPTIONS, TRACE, PUT, DELETE, CONNECT)");
+  printf ("    %s\n", _("Set HTTP method."));
+  printf (" %s\n", "-N, --no-body");
+  printf ("    %s\n", _("Don't wait for document body: stop reading after headers."));
+  printf ("    %s\n", _("(Note that this still does an HTTP GET or POST, not a HEAD.)"));
+  printf (" %s\n", "-M, --max-age=SECONDS");
+  printf ("    %s\n", _("Warn if document is more than SECONDS old. the number can also be of"));
+  printf ("    %s\n", _("the form \"10m\" for minutes, \"10h\" for hours, or \"10d\" for days."));
+  printf (" %s\n", "-T, --content-type=STRING");
+  printf ("    %s\n", _("specify Content-Type header media type when POSTing\n"));
+  printf (" %s\n", "-l, --linespan");
+  printf ("    %s\n", _("Allow regex to span newlines (must precede -r or -R)"));
+  printf (" %s\n", "-r, --regex, --ereg=STRING");
+  printf ("    %s\n", _("Search page for regex STRING"));
+  printf (" %s\n", "-R, --eregi=STRING");
+  printf ("    %s\n", _("Search page for case-insensitive regex STRING"));
+  printf (" %s\n", "--invert-regex");
+  printf ("    %s\n", _("Return CRITICAL if found, OK if not\n"));
+  printf (" %s\n", "-a, --authorization=AUTH_PAIR");
+  printf ("    %s\n", _("Username:password on sites with basic authentication"));
+  printf (" %s\n", "-b, --proxy-authorization=AUTH_PAIR");
+  printf ("    %s\n", _("Username:password on proxy-servers with basic authentication"));
+  printf (" %s\n", "-A, --useragent=STRING");
+  printf ("    %s\n", _("String to be sent in http header as \"User Agent\""));
+  printf (" %s\n", "-k, --header=STRING");
+  printf ("    %s\n", _("Any other tags to be sent in http header. Use multiple times for additional headers"));
+  printf (" %s\n", "-E, --extended-perfdata");
+  printf ("    %s\n", _("Print additional performance data"));
+  printf (" %s\n", "-L, --link");
+  printf ("    %s\n", _("Wrap output in HTML link (obsoleted by urlize)"));
+  printf (" %s\n", "-f, --onredirect=<ok|warning|critical|follow|sticky|stickyport|curl>");
+  printf ("    %s\n", _("How to handle redirected pages. sticky is like follow but stick to the"));
+  printf ("    %s\n", _("specified IP address. stickyport also ensures port stays the same."));
+  printf ("    %s\n", _("follow uses the old redirection algorithm of check_http."));
+  printf ("    %s\n", _("curl uses CURL_FOLLOWLOCATION built into libcurl."));
+  printf (" %s\n", "-m, --pagesize=INTEGER<:INTEGER>");
+  printf ("    %s\n", _("Minimum page size required (bytes) : Maximum page size required (bytes)"));
+  printf ("\n");
+  printf (" %s\n", "--http-version=VERSION");
+  printf ("    %s\n", _("Connect via specific HTTP protocol."));
+  printf ("    %s\n", _("1.0 = HTTP/1.0, 1.1 = HTTP/1.1, 2.0 = HTTP/2 (HTTP/2 will fail without -S)"));
+  printf ("\n");
+
+  printf (UT_WARN_CRIT);
+
+  printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
+
+  printf (UT_VERBOSE);
+
+  printf ("\n");
+  printf ("%s\n", _("Notes:"));
+  printf (" %s\n", _("This plugin will attempt to open an HTTP connection with the host."));
+  printf (" %s\n", _("Successful connects return STATE_OK, refusals and timeouts return STATE_CRITICAL"));
+  printf (" %s\n", _("other errors return STATE_UNKNOWN.  Successful connects, but incorrect response"));
+  printf (" %s\n", _("messages from the host result in STATE_WARNING return values.  If you are"));
+  printf (" %s\n", _("checking a virtual server that uses 'host headers' you must supply the FQDN"));
+  printf (" %s\n", _("(fully qualified domain name) as the [host_name] argument."));
+
+#ifdef LIBCURL_FEATURE_SSL
+  printf ("\n");
+  printf (" %s\n", _("This plugin can also check whether an SSL enabled web server is able to"));
+  printf (" %s\n", _("serve content (optionally within a specified time) or whether the X509 "));
+  printf (" %s\n", _("certificate is still valid for the specified number of days."));
+  printf ("\n");
+  printf (" %s\n", _("Please note that this plugin does not check if the presented server"));
+  printf (" %s\n", _("certificate matches the hostname of the server, or if the certificate"));
+  printf (" %s\n", _("has a valid chain of trust to one of the locally installed CAs."));
+  printf ("\n");
+  printf ("%s\n", _("Examples:"));
+  printf (" %s\n\n", "CHECK CONTENT: check_curl -w 5 -c 10 --ssl -H www.verisign.com");
+  printf (" %s\n", _("When the 'www.verisign.com' server returns its content within 5 seconds,"));
+  printf (" %s\n", _("a STATE_OK will be returned. When the server returns its content but exceeds"));
+  printf (" %s\n", _("the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,"));
+  printf (" %s\n", _("a STATE_CRITICAL will be returned."));
+  printf ("\n");
+  printf (" %s\n\n", "CHECK CERTIFICATE: check_curl -H www.verisign.com -C 14");
+  printf (" %s\n", _("When the certificate of 'www.verisign.com' is valid for more than 14 days,"));
+  printf (" %s\n", _("a STATE_OK is returned. When the certificate is still valid, but for less than"));
+  printf (" %s\n", _("14 days, a STATE_WARNING is returned. A STATE_CRITICAL will be returned when"));
+  printf (" %s\n\n", _("the certificate is expired."));
+  printf ("\n");
+  printf (" %s\n\n", "CHECK CERTIFICATE: check_curl -H www.verisign.com -C 30,14");
+  printf (" %s\n", _("When the certificate of 'www.verisign.com' is valid for more than 30 days,"));
+  printf (" %s\n", _("a STATE_OK is returned. When the certificate is still valid, but for less than"));
+  printf (" %s\n", _("30 days, but more than 14 days, a STATE_WARNING is returned."));
+  printf (" %s\n", _("A STATE_CRITICAL will be returned when certificate expires in less than 14 days"));
+#endif
+
+  printf ("\n %s\n", "CHECK WEBSERVER CONTENT VIA PROXY:");
+  printf (" %s\n", _("It is recommended to use an environment proxy like:"));
+  printf (" %s\n", _("http_proxy=http://192.168.100.35:3128 ./check_curl -H www.monitoring-plugins.org"));
+  printf (" %s\n", _("legacy proxy requests in check_http style still work:"));
+  printf (" %s\n", _("check_curl -I 192.168.100.35 -p 3128 -u http://www.monitoring-plugins.org/ -H www.monitoring-plugins.org"));
+
+#ifdef LIBCURL_FEATURE_SSL
+  printf ("\n %s\n", "CHECK SSL WEBSERVER CONTENT VIA PROXY USING HTTP 1.1 CONNECT: ");
+  printf (" %s\n", _("It is recommended to use an environment proxy like:"));
+  printf (" %s\n", _("https_proxy=http://192.168.100.35:3128 ./check_curl -H www.verisign.com -S"));
+  printf (" %s\n", _("legacy proxy requests in check_http style still work:"));
+  printf (" %s\n", _("check_curl -I 192.168.100.35 -p 3128 -u https://www.verisign.com/ -S -j CONNECT -H www.verisign.com "));
+  printf (" %s\n", _("all these options are needed: -I <proxy> -p <proxy-port> -u <check-url> -S(sl) -j CONNECT -H <webserver>"));
+  printf (" %s\n", _("a STATE_OK will be returned. When the server returns its content but exceeds"));
+  printf (" %s\n", _("the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,"));
+  printf (" %s\n", _("a STATE_CRITICAL will be returned."));
+
+#endif
+
+  printf (UT_SUPPORT);
+
+}
+
+
+
+void
+print_usage (void)
+{
+  printf ("%s\n", _("Usage:"));
+  printf (" %s -H <vhost> | -I <IP-address> [-u <uri>] [-p <port>]\n",progname);
+  printf ("       [-J <client certificate file>] [-K <private key>] [--ca-cert <CA certificate file>]\n");
+  printf ("       [-w <warn time>] [-c <critical time>] [-t <timeout>] [-L] [-E] [-a auth]\n");
+  printf ("       [-b proxy_auth] [-f <ok|warning|critcal|follow|sticky|stickyport|curl>]\n");
+  printf ("       [-e <expect>] [-d string] [-s string] [-l] [-r <regex> | -R <case-insensitive regex>]\n");
+  printf ("       [-P string] [-m <min_pg_size>:<max_pg_size>] [-4|-6] [-N] [-M <age>]\n");
+  printf ("       [-A string] [-k string] [-S <version>] [--sni] [-C <warn_age>[,<crit_age>]]\n");
+  printf ("       [-T <content-type>] [-j method]\n");
+  printf ("       [--http-version=<version>]\n");
+  printf ("\n");
+  printf ("%s\n", _("WARNING: check_curl is experimental. Please use"));
+  printf ("%s\n\n", _("check_http if you need a stable version."));
+}
+
+void
+print_curl_version (void)
+{
+  printf( "%s\n", curl_version());
+}
+
+int
+curlhelp_initwritebuffer (curlhelp_write_curlbuf *buf)
+{
+  buf->bufsize = DEFAULT_BUFFER_SIZE;
+  buf->buflen = 0;
+  buf->buf = (char *)malloc ((size_t)buf->bufsize);
+  if (buf->buf == NULL) return -1;
+  return 0;
+}
+
+int
+curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *stream)
+{
+  curlhelp_write_curlbuf *buf = (curlhelp_write_curlbuf *)stream;
+
+  while (buf->bufsize < buf->buflen + size * nmemb + 1) {
+    buf->bufsize *= buf->bufsize * 2;
+    buf->buf = (char *)realloc (buf->buf, buf->bufsize);
+    if (buf->buf == NULL) return -1;
+  }
+
+  memcpy (buf->buf + buf->buflen, buffer, size * nmemb);
+  buf->buflen += size * nmemb;
+  buf->buf[buf->buflen] = '\0';
+
+  return (int)(size * nmemb);
+}
+
+int
+curlhelp_buffer_read_callback (void *buffer, size_t size, size_t nmemb, void *stream)
+{
+  curlhelp_read_curlbuf *buf = (curlhelp_read_curlbuf *)stream;
+
+  size_t n = min (nmemb * size, buf->buflen - buf->pos);
+
+  memcpy (buffer, buf->buf + buf->pos, n);
+  buf->pos += n;
+
+  return (int)n;
+}
+
+void
+curlhelp_freewritebuffer (curlhelp_write_curlbuf *buf)
+{
+  free (buf->buf);
+  buf->buf = NULL;
+}
+
+int
+curlhelp_initreadbuffer (curlhelp_read_curlbuf *buf, const char *data, size_t datalen)
+{
+  buf->buflen = datalen;
+  buf->buf = (char *)malloc ((size_t)buf->buflen);
+  if (buf->buf == NULL) return -1;
+  memcpy (buf->buf, data, datalen);
+  buf->pos = 0;
+  return 0;
+}
+
+void
+curlhelp_freereadbuffer (curlhelp_read_curlbuf *buf)
+{
+  free (buf->buf);
+  buf->buf = NULL;
+}
+
+/* TODO: where to put this, it's actually part of sstrings2 (logically)?
+ */
+const char*
+strrstr2(const char *haystack, const char *needle)
+{
+  int counter;
+  size_t len;
+  const char *prev_pos;
+  const char *pos;
+
+  if (haystack == NULL || needle == NULL)
+    return NULL;
+
+  if (haystack[0] == '\0' || needle[0] == '\0')
+    return NULL;
+
+  counter = 0;
+  prev_pos = NULL;
+  pos = haystack;
+  len = strlen (needle);
+  for (;;) {
+    pos = strstr (pos, needle);
+    if (pos == NULL) {
+      if (counter == 0)
+        return NULL;
+      else
+        return prev_pos;
+    }
+    counter++;
+    prev_pos = pos;
+    pos += len;
+    if (*pos == '\0') return prev_pos;
+  }
+}
+
+int
+curlhelp_parse_statusline (const char *buf, curlhelp_statusline *status_line)
+{
+  char *first_line_end;
+  char *p;
+  size_t first_line_len;
+  char *pp;
+  const char *start;
+  char *first_line_buf;
+
+  /* find last start of a new header */
+  start = strrstr2 (buf, "\r\nHTTP");
+  if (start != NULL) {
+    start += 2;
+    buf = start;
+  }
+
+  first_line_end = strstr(buf, "\r\n");
+  if (first_line_end == NULL) return -1;
+
+  first_line_len = (size_t)(first_line_end - buf);
+  status_line->first_line = (char *)malloc (first_line_len + 1);
+  if (status_line->first_line == NULL) return -1;
+  memcpy (status_line->first_line, buf, first_line_len);
+  status_line->first_line[first_line_len] = '\0';
+  first_line_buf = strdup( status_line->first_line );
+
+  /* protocol and version: "HTTP/x.x" SP or "HTTP/2" SP */
+
+  p = strtok(first_line_buf, "/");
+  if( p == NULL ) { free( first_line_buf ); return -1; }
+  if( strcmp( p, "HTTP" ) != 0 ) { free( first_line_buf ); return -1; }
+
+  p = strtok( NULL, " " );
+  if( p == NULL ) { free( first_line_buf ); return -1; }
+  if( strchr( p, '.' ) != NULL ) {
+
+    /* HTTP 1.x case */
+    char *ppp;
+    ppp = strtok( p, "." );
+    status_line->http_major = (int)strtol( p, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    ppp = strtok( NULL, " " );
+    status_line->http_minor = (int)strtol( p, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    p += 4; /* 1.x SP */
+  } else {
+    /* HTTP 2 case */
+    status_line->http_major = (int)strtol( p, &pp, 10 );
+    status_line->http_minor = 0;
+    p += 2; /* 2 SP */
+  }
+
+  /* status code: "404" or "404.1", then SP */
+
+  p = strtok( p, " " );
+  if( p == NULL ) { free( first_line_buf ); return -1; }
+  if( strchr( p, '.' ) != NULL ) {
+    char *ppp;
+    ppp = strtok( p, "." );
+    status_line->http_code = (int)strtol( ppp, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    ppp = strtok( NULL, "" );
+    status_line->http_subcode = (int)strtol( ppp, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    p += 6; /* 400.1 SP */
+  } else {
+    status_line->http_code = (int)strtol( p, &pp, 10 );
+    status_line->http_subcode = -1;
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    p += 4; /* 400 SP */
+  }
+
+  /* Human readable message: "Not Found" CRLF */
+
+  p = strtok( p, "" );
+  if( p == NULL ) { status_line->msg = ""; return 0; }
+  status_line->msg = status_line->first_line + ( p - first_line_buf );
+  free( first_line_buf );
+
+  return 0;
+}
+
+void
+curlhelp_free_statusline (curlhelp_statusline *status_line)
+{
+  free (status_line->first_line);
+}
+
+void
+remove_newlines (char *s)
+{
+  char *p;
+
+  for (p = s; *p != '\0'; p++)
+    if (*p == '\r' || *p == '\n')
+      *p = ' ';
+}
+
+char *
+get_header_value (const struct phr_header* headers, const size_t nof_headers, const char* header)
+{
+  int i;
+  for( i = 0; i < nof_headers; i++ ) {
+    if( strncasecmp( header, headers[i].name, max( headers[i].name_len, 4 ) ) == 0 ) {
+      return strndup( headers[i].value, headers[i].value_len );
+    }
+  }
+  return NULL;
+}
+
+int
+check_document_dates (const curlhelp_write_curlbuf *header_buf, char (*msg)[DEFAULT_BUFFER_SIZE])
+{
+  char *server_date = NULL;
+  char *document_date = NULL;
+  int date_result = STATE_OK;
+  curlhelp_statusline status_line;
+  struct phr_header headers[255];
+  size_t nof_headers = 255;
+  size_t msglen;
+
+  int res = phr_parse_response (header_buf->buf, header_buf->buflen,
+    &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
+    headers, &nof_headers, 0);
+
+  server_date = get_header_value (headers, nof_headers, "date");
+  document_date = get_header_value (headers, nof_headers, "last-modified");
+
+  if (!server_date || !*server_date) {
+    snprintf (*msg, DEFAULT_BUFFER_SIZE, _("%sServer date unknown, "), *msg);
+    date_result = max_state_alt(STATE_UNKNOWN, date_result);
+  } else if (!document_date || !*document_date) {
+    snprintf (*msg, DEFAULT_BUFFER_SIZE, _("%sDocument modification date unknown, "), *msg);
+    date_result = max_state_alt(STATE_CRITICAL, date_result);
+  } else {
+    time_t srv_data = curl_getdate (server_date, NULL);
+    time_t doc_data = curl_getdate (document_date, NULL);
+    if (verbose >= 2)
+      printf ("* server date: '%s' (%d), doc_date: '%s' (%d)\n", server_date, (int)srv_data, document_date, (int)doc_data);
+    if (srv_data <= 0) {
+      snprintf (*msg, DEFAULT_BUFFER_SIZE, _("%sServer date \"%100s\" unparsable, "), *msg, server_date);
+      date_result = max_state_alt(STATE_CRITICAL, date_result);
+    } else if (doc_data <= 0) {
+      snprintf (*msg, DEFAULT_BUFFER_SIZE, _("%sDocument date \"%100s\" unparsable, "), *msg, document_date);
+      date_result = max_state_alt(STATE_CRITICAL, date_result);
+    } else if (doc_data > srv_data + 30) {
+      snprintf (*msg, DEFAULT_BUFFER_SIZE, _("%sDocument is %d seconds in the future, "), *msg, (int)doc_data - (int)srv_data);
+      date_result = max_state_alt(STATE_CRITICAL, date_result);
+    } else if (doc_data < srv_data - maximum_age) {
+      int n = (srv_data - doc_data);
+      if (n > (60 * 60 * 24 * 2)) {
+        snprintf (*msg, DEFAULT_BUFFER_SIZE, _("%sLast modified %.1f days ago, "), *msg, ((float) n) / (60 * 60 * 24));
+        date_result = max_state_alt(STATE_CRITICAL, date_result);
+      } else {
+        snprintf (*msg, DEFAULT_BUFFER_SIZE, _("%sLast modified %d:%02d:%02d ago, "), *msg, n / (60 * 60), (n / 60) % 60, n % 60);
+        date_result = max_state_alt(STATE_CRITICAL, date_result);
+      }
+    }
+  }
+
+  if (server_date) free (server_date);
+  if (document_date) free (document_date);
+
+  return date_result;
+}
+
+
+int
+get_content_length (const curlhelp_write_curlbuf* header_buf, const curlhelp_write_curlbuf* body_buf)
+{
+  const char *s;
+  int content_length = 0;
+  char *copy;
+  struct phr_header headers[255];
+  size_t nof_headers = 255;
+  size_t msglen;
+  char *content_length_s = NULL;
+  curlhelp_statusline status_line;
+
+  int res = phr_parse_response (header_buf->buf, header_buf->buflen,
+    &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
+    headers, &nof_headers, 0);
+
+  content_length_s = get_header_value (headers, nof_headers, "content-length");
+  if (!content_length_s) {
+    return header_buf->buflen + body_buf->buflen;
+  }
+  content_length_s += strspn (content_length_s, " \t");
+  content_length = atoi (content_length_s);
+  if (content_length != body_buf->buflen) {
+    /* TODO: should we warn if the actual and the reported body length don't match? */
+  }
+
+  if (content_length_s) free (content_length_s);
+
+  return header_buf->buflen + body_buf->buflen;
+}
+
+/* TODO: is there a better way in libcurl to check for the SSL library? */
+curlhelp_ssl_library
+curlhelp_get_ssl_library (CURL* curl)
+{
+  curl_version_info_data* version_data;
+  char *ssl_version;
+  char *library;
+  curlhelp_ssl_library ssl_library = CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  version_data = curl_version_info (CURLVERSION_NOW);
+  if (version_data == NULL) return CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  ssl_version = strdup (version_data->ssl_version);
+  if (ssl_version == NULL ) return CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  library = strtok (ssl_version, "/");
+  if (library == NULL) return CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  if (strcmp (library, "OpenSSL") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_OPENSSL;
+  else if (strcmp (library, "LibreSSL") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_LIBRESSL;
+  else if (strcmp (library, "GnuTLS") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_GNUTLS;
+  else if (strcmp (library, "NSS") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_NSS;
+
+  if (verbose >= 2)
+    printf ("* SSL library string is : %s %s (%d)\n", version_data->ssl_version, library, ssl_library);
+
+  free (ssl_version);
+
+  return ssl_library;
+}
+
+const char*
+curlhelp_get_ssl_library_string (curlhelp_ssl_library ssl_library)
+{
+  switch (ssl_library) {
+    case CURLHELP_SSL_LIBRARY_OPENSSL:
+      return "OpenSSL";
+    case CURLHELP_SSL_LIBRARY_LIBRESSL:
+      return "LibreSSL";
+    case CURLHELP_SSL_LIBRARY_GNUTLS:
+      return "GnuTLS";
+    case CURLHELP_SSL_LIBRARY_NSS:
+      return "NSS";
+    case CURLHELP_SSL_LIBRARY_UNKNOWN:
+    default:
+      return "unknown";
+  }
+}
+
+#ifdef LIBCURL_FEATURE_SSL
+#ifndef USE_OPENSSL
+time_t
+parse_cert_date (const char *s)
+{
+  struct tm tm;
+  time_t date;
+  char *res;
+
+  if (!s) return -1;
+
+  /* Jan 17 14:25:12 2020 GMT */
+  res = strptime (s, "%Y-%m-%d %H:%M:%S GMT", &tm);
+  /* Sep 11 12:00:00 2020 GMT */
+  if (res == NULL) strptime (s, "%Y %m %d %H:%M:%S GMT", &tm);
+  date = mktime (&tm);
+
+  return date;
+}
+
+/* TODO: this needs cleanup in the sslutils.c, maybe we the #else case to
+ * OpenSSL could be this function
+ */
+int
+net_noopenssl_check_certificate (cert_ptr_union* cert_ptr, int days_till_exp_warn, int days_till_exp_crit)
+{
+  int i;
+  struct curl_slist* slist;
+  int cname_found = 0;
+  char* start_date_str = NULL;
+  char* end_date_str = NULL;
+  time_t start_date;
+  time_t end_date;
+	char *tz;
+	float time_left;
+	int days_left;
+	int time_remaining;
+	char timestamp[50] = "";
+	int status = STATE_UNKNOWN;
+
+  if (verbose >= 2)
+    printf ("**** REQUEST CERTIFICATES ****\n");
+
+  for (i = 0; i < cert_ptr->to_certinfo->num_of_certs; i++) {
+    for (slist = cert_ptr->to_certinfo->certinfo[i]; slist; slist = slist->next) {
+      /* find first common name in subject,
+       * TODO: check alternative subjects for
+       * TODO: have a decent parser here and not a hack
+       * multi-host certificate, check wildcards
+       */
+      if (strncasecmp (slist->data, "Subject:", 8) == 0) {
+        int d = 3;
+        char* p = strstr (slist->data, "CN=");
+        if (p == NULL) {
+          d = 5;
+          p = strstr (slist->data, "CN = ");
+        }
+        if (p != NULL) {
+          if (strncmp (host_name, p+d, strlen (host_name)) == 0) {
+            cname_found = 1;
+          }
+        }
+      } else if (strncasecmp (slist->data, "Start Date:", 11) == 0) {
+        start_date_str = &slist->data[11];
+      } else if (strncasecmp (slist->data, "Expire Date:", 12) == 0) {
+        end_date_str = &slist->data[12];
+      } else if (strncasecmp (slist->data, "Cert:", 5) == 0) {
+        goto HAVE_FIRST_CERT;
+      }
+      if (verbose >= 2)
+        printf ("%d ** %s\n", i, slist->data);
+    }
+  }
+HAVE_FIRST_CERT:
+
+  if (verbose >= 2)
+    printf ("**** REQUEST CERTIFICATES ****\n");
+
+  if (!cname_found) {
+		printf("%s\n",_("CRITICAL - Cannot retrieve certificate subject."));
+		return STATE_CRITICAL;
+  }
+
+  start_date = parse_cert_date (start_date_str);
+  if (start_date <= 0) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("WARNING - Unparsable 'Start Date' in certificate: '%s'"),
+      start_date_str);
+    puts (msg);
+    return STATE_WARNING;
+  }
+
+  end_date = parse_cert_date (end_date_str);
+  if (end_date <= 0) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("WARNING - Unparsable 'Expire Date' in certificate: '%s'"),
+      start_date_str);
+    puts (msg);
+    return STATE_WARNING;
+  }
+
+  time_left = difftime (end_date, time(NULL));
+	days_left = time_left / 86400;
+	tz = getenv("TZ");
+	setenv("TZ", "GMT", 1);
+	tzset();
+	strftime(timestamp, 50, "%c %z", localtime(&end_date));
+	if (tz)
+		setenv("TZ", tz, 1);
+	else
+		unsetenv("TZ");
+	tzset();
+
+	if (days_left > 0 && days_left <= days_till_exp_warn) {
+		printf (_("%s - Certificate '%s' expires in %d day(s) (%s).\n"), (days_left>days_till_exp_crit)?"WARNING":"CRITICAL", host_name, days_left, timestamp);
+		if (days_left > days_till_exp_crit)
+			status = STATE_WARNING;
+		else
+			status = STATE_CRITICAL;
+	} else if (days_left == 0 && time_left > 0) {
+		if (time_left >= 3600)
+			time_remaining = (int) time_left / 3600;
+		else
+			time_remaining = (int) time_left / 60;
+
+		printf (_("%s - Certificate '%s' expires in %u %s (%s)\n"),
+			(days_left>days_till_exp_crit) ? "WARNING" : "CRITICAL", host_name, time_remaining,
+			time_left >= 3600 ? "hours" : "minutes", timestamp);
+
+		if ( days_left > days_till_exp_crit)
+			status = STATE_WARNING;
+		else
+			status = STATE_CRITICAL;
+	} else if (time_left < 0) {
+		printf(_("CRITICAL - Certificate '%s' expired on %s.\n"), host_name, timestamp);
+		status=STATE_CRITICAL;
+	} else if (days_left == 0) {
+		printf (_("%s - Certificate '%s' just expired (%s).\n"), (days_left>days_till_exp_crit)?"WARNING":"CRITICAL", host_name, timestamp);
+		if (days_left > days_till_exp_crit)
+			status = STATE_WARNING;
+		else
+			status = STATE_CRITICAL;
+	} else {
+		printf(_("OK - Certificate '%s' will expire on %s.\n"), host_name, timestamp);
+		status = STATE_OK;
+	}
+	return status;
+}
+#endif /* USE_OPENSSL */
+#endif /* LIBCURL_FEATURE_SSL */
diff --git a/plugins/picohttpparser/Makefile.am b/plugins/picohttpparser/Makefile.am
new file mode 100644
index 00000000..87e05313
--- /dev/null
+++ b/plugins/picohttpparser/Makefile.am
@@ -0,0 +1,3 @@
+noinst_LIBRARIES = libpicohttpparser.a
+
+libpicohttpparser_a_SOURCES = picohttpparser.c picohttpparser.h
diff --git a/plugins/picohttpparser/picohttpparser.c b/plugins/picohttpparser/picohttpparser.c
new file mode 100644
index 00000000..74ccc3ef
--- /dev/null
+++ b/plugins/picohttpparser/picohttpparser.c
@@ -0,0 +1,645 @@
+/*
+ * Copyright (c) 2009-2014 Kazuho Oku, Tokuhiro Matsuno, Daisuke Murase,
+ *                         Shigeo Mitsunari
+ *
+ * The software is licensed under either the MIT License (below) or the Perl
+ * license.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stddef.h>
+#include <string.h>
+#ifdef __SSE4_2__
+#ifdef _MSC_VER
+#include <nmmintrin.h>
+#else
+#include <x86intrin.h>
+#endif
+#endif
+#include "picohttpparser.h"
+
+#if __GNUC__ >= 3
+#define likely(x) __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#else
+#define likely(x) (x)
+#define unlikely(x) (x)
+#endif
+
+#ifdef _MSC_VER
+#define ALIGNED(n) _declspec(align(n))
+#else
+#define ALIGNED(n) __attribute__((aligned(n)))
+#endif
+
+#define IS_PRINTABLE_ASCII(c) ((unsigned char)(c)-040u < 0137u)
+
+#define CHECK_EOF()                                                                                                                \
+    if (buf == buf_end) {                                                                                                          \
+        *ret = -2;                                                                                                                 \
+        return NULL;                                                                                                               \
+    }
+
+#define EXPECT_CHAR_NO_CHECK(ch)                                                                                                   \
+    if (*buf++ != ch) {                                                                                                            \
+        *ret = -1;                                                                                                                 \
+        return NULL;                                                                                                               \
+    }
+
+#define EXPECT_CHAR(ch)                                                                                                            \
+    CHECK_EOF();                                                                                                                   \
+    EXPECT_CHAR_NO_CHECK(ch);
+
+#define ADVANCE_TOKEN(tok, toklen)                                                                                                 \
+    do {                                                                                                                           \
+        const char *tok_start = buf;                                                                                               \
+        static const char ALIGNED(16) ranges2[16] = "\000\040\177\177";                                                            \
+        int found2;                                                                                                                \
+        buf = findchar_fast(buf, buf_end, ranges2, 4, &found2);                                                                    \
+        if (!found2) {                                                                                                             \
+            CHECK_EOF();                                                                                                           \
+        }                                                                                                                          \
+        while (1) {                                                                                                                \
+            if (*buf == ' ') {                                                                                                     \
+                break;                                                                                                             \
+            } else if (unlikely(!IS_PRINTABLE_ASCII(*buf))) {                                                                      \
+                if ((unsigned char)*buf < '\040' || *buf == '\177') {                                                              \
+                    *ret = -1;                                                                                                     \
+                    return NULL;                                                                                                   \
+                }                                                                                                                  \
+            }                                                                                                                      \
+            ++buf;                                                                                                                 \
+            CHECK_EOF();                                                                                                           \
+        }                                                                                                                          \
+        tok = tok_start;                                                                                                           \
+        toklen = buf - tok_start;                                                                                                  \
+    } while (0)
+
+static const char *token_char_map = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+                                    "\0\1\0\1\1\1\1\1\0\0\1\1\0\1\1\0\1\1\1\1\1\1\1\1\1\1\0\0\0\0\0\0"
+                                    "\0\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\0\0\0\1\1"
+                                    "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\0\1\0\1\0"
+                                    "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+                                    "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+                                    "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+                                    "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+
+static const char *findchar_fast(const char *buf, const char *buf_end, const char *ranges, size_t ranges_size, int *found)
+{
+    *found = 0;
+#if __SSE4_2__
+    if (likely(buf_end - buf >= 16)) {
+        __m128i ranges16 = _mm_loadu_si128((const __m128i *)ranges);
+
+        size_t left = (buf_end - buf) & ~15;
+        do {
+            __m128i b16 = _mm_loadu_si128((const __m128i *)buf);
+            int r = _mm_cmpestri(ranges16, ranges_size, b16, 16, _SIDD_LEAST_SIGNIFICANT | _SIDD_CMP_RANGES | _SIDD_UBYTE_OPS);
+            if (unlikely(r != 16)) {
+                buf += r;
+                *found = 1;
+                break;
+            }
+            buf += 16;
+            left -= 16;
+        } while (likely(left != 0));
+    }
+#else
+    /* suppress unused parameter warning */
+    (void)buf_end;
+    (void)ranges;
+    (void)ranges_size;
+#endif
+    return buf;
+}
+
+static const char *get_token_to_eol(const char *buf, const char *buf_end, const char **token, size_t *token_len, int *ret)
+{
+    const char *token_start = buf;
+
+#ifdef __SSE4_2__
+    static const char ALIGNED(16) ranges1[16] = "\0\010"    /* allow HT */
+                                                "\012\037"  /* allow SP and up to but not including DEL */
+                                                "\177\177"; /* allow chars w. MSB set */
+    int found;
+    buf = findchar_fast(buf, buf_end, ranges1, 6, &found);
+    if (found)
+        goto FOUND_CTL;
+#else
+    /* find non-printable char within the next 8 bytes, this is the hottest code; manually inlined */
+    while (likely(buf_end - buf >= 8)) {
+#define DOIT()                                                                                                                     \
+    do {                                                                                                                           \
+        if (unlikely(!IS_PRINTABLE_ASCII(*buf)))                                                                                   \
+            goto NonPrintable;                                                                                                     \
+        ++buf;                                                                                                                     \
+    } while (0)
+        DOIT();
+        DOIT();
+        DOIT();
+        DOIT();
+        DOIT();
+        DOIT();
+        DOIT();
+        DOIT();
+#undef DOIT
+        continue;
+    NonPrintable:
+        if ((likely((unsigned char)*buf < '\040') && likely(*buf != '\011')) || unlikely(*buf == '\177')) {
+            goto FOUND_CTL;
+        }
+        ++buf;
+    }
+#endif
+    for (;; ++buf) {
+        CHECK_EOF();
+        if (unlikely(!IS_PRINTABLE_ASCII(*buf))) {
+            if ((likely((unsigned char)*buf < '\040') && likely(*buf != '\011')) || unlikely(*buf == '\177')) {
+                goto FOUND_CTL;
+            }
+        }
+    }
+FOUND_CTL:
+    if (likely(*buf == '\015')) {
+        ++buf;
+        EXPECT_CHAR('\012');
+        *token_len = buf - 2 - token_start;
+    } else if (*buf == '\012') {
+        *token_len = buf - token_start;
+        ++buf;
+    } else {
+        *ret = -1;
+        return NULL;
+    }
+    *token = token_start;
+
+    return buf;
+}
+
+static const char *is_complete(const char *buf, const char *buf_end, size_t last_len, int *ret)
+{
+    int ret_cnt = 0;
+    buf = last_len < 3 ? buf : buf + last_len - 3;
+
+    while (1) {
+        CHECK_EOF();
+        if (*buf == '\015') {
+            ++buf;
+            CHECK_EOF();
+            EXPECT_CHAR('\012');
+            ++ret_cnt;
+        } else if (*buf == '\012') {
+            ++buf;
+            ++ret_cnt;
+        } else {
+            ++buf;
+            ret_cnt = 0;
+        }
+        if (ret_cnt == 2) {
+            return buf;
+        }
+    }
+
+    *ret = -2;
+    return NULL;
+}
+
+#define PARSE_INT(valp_, mul_)                                                                                                     \
+    if (*buf < '0' || '9' < *buf) {                                                                                                \
+        buf++;                                                                                                                     \
+        *ret = -1;                                                                                                                 \
+        return NULL;                                                                                                               \
+    }                                                                                                                              \
+    *(valp_) = (mul_) * (*buf++ - '0');
+
+#define PARSE_INT_3(valp_)                                                                                                         \
+    do {                                                                                                                           \
+        int res_ = 0;                                                                                                              \
+        PARSE_INT(&res_, 100)                                                                                                      \
+        *valp_ = res_;                                                                                                             \
+        PARSE_INT(&res_, 10)                                                                                                       \
+        *valp_ += res_;                                                                                                            \
+        PARSE_INT(&res_, 1)                                                                                                        \
+        *valp_ += res_;                                                                                                            \
+    } while (0)
+
+/* returned pointer is always within [buf, buf_end), or null */
+static const char *parse_http_version(const char *buf, const char *buf_end, int *minor_version, int *ret)
+{
+    /* we want at least [HTTP/1.<two chars>] to try to parse */
+    if (buf_end - buf < 9) {
+        *ret = -2;
+        return NULL;
+    }
+    EXPECT_CHAR_NO_CHECK('H');
+    EXPECT_CHAR_NO_CHECK('T');
+    EXPECT_CHAR_NO_CHECK('T');
+    EXPECT_CHAR_NO_CHECK('P');
+    EXPECT_CHAR_NO_CHECK('/');
+    EXPECT_CHAR_NO_CHECK('1');
+    EXPECT_CHAR_NO_CHECK('.');
+    PARSE_INT(minor_version, 1);
+    return buf;
+}
+
+static const char *parse_headers(const char *buf, const char *buf_end, struct phr_header *headers, size_t *num_headers,
+                                 size_t max_headers, int *ret)
+{
+    for (;; ++*num_headers) {
+        CHECK_EOF();
+        if (*buf == '\015') {
+            ++buf;
+            EXPECT_CHAR('\012');
+            break;
+        } else if (*buf == '\012') {
+            ++buf;
+            break;
+        }
+        if (*num_headers == max_headers) {
+            *ret = -1;
+            return NULL;
+        }
+        if (!(*num_headers != 0 && (*buf == ' ' || *buf == '\t'))) {
+            /* parsing name, but do not discard SP before colon, see
+             * http://www.mozilla.org/security/announce/2006/mfsa2006-33.html */
+            headers[*num_headers].name = buf;
+            static const char ALIGNED(16) ranges1[] = "\x00 "  /* control chars and up to SP */
+                                                      "\"\""   /* 0x22 */
+                                                      "()"     /* 0x28,0x29 */
+                                                      ",,"     /* 0x2c */
+                                                      "//"     /* 0x2f */
+                                                      ":@"     /* 0x3a-0x40 */
+                                                      "[]"     /* 0x5b-0x5d */
+                                                      "{\377"; /* 0x7b-0xff */
+            int found;
+            buf = findchar_fast(buf, buf_end, ranges1, sizeof(ranges1) - 1, &found);
+            if (!found) {
+                CHECK_EOF();
+            }
+            while (1) {
+                if (*buf == ':') {
+                    break;
+                } else if (!token_char_map[(unsigned char)*buf]) {
+                    *ret = -1;
+                    return NULL;
+                }
+                ++buf;
+                CHECK_EOF();
+            }
+            if ((headers[*num_headers].name_len = buf - headers[*num_headers].name) == 0) {
+                *ret = -1;
+                return NULL;
+            }
+            ++buf;
+            for (;; ++buf) {
+                CHECK_EOF();
+                if (!(*buf == ' ' || *buf == '\t')) {
+                    break;
+                }
+            }
+        } else {
+            headers[*num_headers].name = NULL;
+            headers[*num_headers].name_len = 0;
+        }
+        const char *value;
+        size_t value_len;
+        if ((buf = get_token_to_eol(buf, buf_end, &value, &value_len, ret)) == NULL) {
+            return NULL;
+        }
+        /* remove trailing SPs and HTABs */
+        const char *value_end = value + value_len;
+        for (; value_end != value; --value_end) {
+            const char c = *(value_end - 1);
+            if (!(c == ' ' || c == '\t')) {
+                break;
+            }
+        }
+        headers[*num_headers].value = value;
+        headers[*num_headers].value_len = value_end - value;
+    }
+    return buf;
+}
+
+static const char *parse_request(const char *buf, const char *buf_end, const char **method, size_t *method_len, const char **path,
+                                 size_t *path_len, int *minor_version, struct phr_header *headers, size_t *num_headers,
+                                 size_t max_headers, int *ret)
+{
+    /* skip first empty line (some clients add CRLF after POST content) */
+    CHECK_EOF();
+    if (*buf == '\015') {
+        ++buf;
+        EXPECT_CHAR('\012');
+    } else if (*buf == '\012') {
+        ++buf;
+    }
+
+    /* parse request line */
+    ADVANCE_TOKEN(*method, *method_len);
+    do {
+        ++buf;
+    } while (*buf == ' ');
+    ADVANCE_TOKEN(*path, *path_len);
+    do {
+        ++buf;
+    } while (*buf == ' ');
+    if (*method_len == 0 || *path_len == 0) {
+        *ret = -1;
+        return NULL;
+    }
+    if ((buf = parse_http_version(buf, buf_end, minor_version, ret)) == NULL) {
+        return NULL;
+    }
+    if (*buf == '\015') {
+        ++buf;
+        EXPECT_CHAR('\012');
+    } else if (*buf == '\012') {
+        ++buf;
+    } else {
+        *ret = -1;
+        return NULL;
+    }
+
+    return parse_headers(buf, buf_end, headers, num_headers, max_headers, ret);
+}
+
+int phr_parse_request(const char *buf_start, size_t len, const char **method, size_t *method_len, const char **path,
+                      size_t *path_len, int *minor_version, struct phr_header *headers, size_t *num_headers, size_t last_len)
+{
+    const char *buf = buf_start, *buf_end = buf_start + len;
+    size_t max_headers = *num_headers;
+    int r;
+
+    *method = NULL;
+    *method_len = 0;
+    *path = NULL;
+    *path_len = 0;
+    *minor_version = -1;
+    *num_headers = 0;
+
+    /* if last_len != 0, check if the request is complete (a fast countermeasure
+       againt slowloris */
+    if (last_len != 0 && is_complete(buf, buf_end, last_len, &r) == NULL) {
+        return r;
+    }
+
+    if ((buf = parse_request(buf, buf_end, method, method_len, path, path_len, minor_version, headers, num_headers, max_headers,
+                             &r)) == NULL) {
+        return r;
+    }
+
+    return (int)(buf - buf_start);
+}
+
+static const char *parse_response(const char *buf, const char *buf_end, int *minor_version, int *status, const char **msg,
+                                  size_t *msg_len, struct phr_header *headers, size_t *num_headers, size_t max_headers, int *ret)
+{
+    /* parse "HTTP/1.x" */
+    if ((buf = parse_http_version(buf, buf_end, minor_version, ret)) == NULL) {
+        return NULL;
+    }
+    /* skip space */
+    if (*buf != ' ') {
+        *ret = -1;
+        return NULL;
+    }
+    do {
+        ++buf;
+    } while (*buf == ' ');
+    /* parse status code, we want at least [:digit:][:digit:][:digit:]<other char> to try to parse */
+    if (buf_end - buf < 4) {
+        *ret = -2;
+        return NULL;
+    }
+    PARSE_INT_3(status);
+
+    /* get message includig preceding space */
+    if ((buf = get_token_to_eol(buf, buf_end, msg, msg_len, ret)) == NULL) {
+        return NULL;
+    }
+    if (*msg_len == 0) {
+        /* ok */
+    } else if (**msg == ' ') {
+        /* remove preceding space */
+        do {
+            ++*msg;
+            --*msg_len;
+        } while (**msg == ' ');
+    } else {
+        /* garbage found after status code */
+        *ret = -1;
+        return NULL;
+    }
+
+    return parse_headers(buf, buf_end, headers, num_headers, max_headers, ret);
+}
+
+int phr_parse_response(const char *buf_start, size_t len, int *minor_version, int *status, const char **msg, size_t *msg_len,
+                       struct phr_header *headers, size_t *num_headers, size_t last_len)
+{
+    const char *buf = buf_start, *buf_end = buf + len;
+    size_t max_headers = *num_headers;
+    int r;
+
+    *minor_version = -1;
+    *status = 0;
+    *msg = NULL;
+    *msg_len = 0;
+    *num_headers = 0;
+
+    /* if last_len != 0, check if the response is complete (a fast countermeasure
+       against slowloris */
+    if (last_len != 0 && is_complete(buf, buf_end, last_len, &r) == NULL) {
+        return r;
+    }
+
+    if ((buf = parse_response(buf, buf_end, minor_version, status, msg, msg_len, headers, num_headers, max_headers, &r)) == NULL) {
+        return r;
+    }
+
+    return (int)(buf - buf_start);
+}
+
+int phr_parse_headers(const char *buf_start, size_t len, struct phr_header *headers, size_t *num_headers, size_t last_len)
+{
+    const char *buf = buf_start, *buf_end = buf + len;
+    size_t max_headers = *num_headers;
+    int r;
+
+    *num_headers = 0;
+
+    /* if last_len != 0, check if the response is complete (a fast countermeasure
+       against slowloris */
+    if (last_len != 0 && is_complete(buf, buf_end, last_len, &r) == NULL) {
+        return r;
+    }
+
+    if ((buf = parse_headers(buf, buf_end, headers, num_headers, max_headers, &r)) == NULL) {
+        return r;
+    }
+
+    return (int)(buf - buf_start);
+}
+
+enum {
+    CHUNKED_IN_CHUNK_SIZE,
+    CHUNKED_IN_CHUNK_EXT,
+    CHUNKED_IN_CHUNK_DATA,
+    CHUNKED_IN_CHUNK_CRLF,
+    CHUNKED_IN_TRAILERS_LINE_HEAD,
+    CHUNKED_IN_TRAILERS_LINE_MIDDLE
+};
+
+static int decode_hex(int ch)
+{
+    if ('0' <= ch && ch <= '9') {
+        return ch - '0';
+    } else if ('A' <= ch && ch <= 'F') {
+        return ch - 'A' + 0xa;
+    } else if ('a' <= ch && ch <= 'f') {
+        return ch - 'a' + 0xa;
+    } else {
+        return -1;
+    }
+}
+
+ssize_t phr_decode_chunked(struct phr_chunked_decoder *decoder, char *buf, size_t *_bufsz)
+{
+    size_t dst = 0, src = 0, bufsz = *_bufsz;
+    ssize_t ret = -2; /* incomplete */
+
+    while (1) {
+        switch (decoder->_state) {
+        case CHUNKED_IN_CHUNK_SIZE:
+            for (;; ++src) {
+                int v;
+                if (src == bufsz)
+                    goto Exit;
+                if ((v = decode_hex(buf[src])) == -1) {
+                    if (decoder->_hex_count == 0) {
+                        ret = -1;
+                        goto Exit;
+                    }
+                    break;
+                }
+                if (decoder->_hex_count == sizeof(size_t) * 2) {
+                    ret = -1;
+                    goto Exit;
+                }
+                decoder->bytes_left_in_chunk = decoder->bytes_left_in_chunk * 16 + v;
+                ++decoder->_hex_count;
+            }
+            decoder->_hex_count = 0;
+            decoder->_state = CHUNKED_IN_CHUNK_EXT;
+        /* fallthru */
+        case CHUNKED_IN_CHUNK_EXT:
+            /* RFC 7230 A.2 "Line folding in chunk extensions is disallowed" */
+            for (;; ++src) {
+                if (src == bufsz)
+                    goto Exit;
+                if (buf[src] == '\012')
+                    break;
+            }
+            ++src;
+            if (decoder->bytes_left_in_chunk == 0) {
+                if (decoder->consume_trailer) {
+                    decoder->_state = CHUNKED_IN_TRAILERS_LINE_HEAD;
+                    break;
+                } else {
+                    goto Complete;
+                }
+            }
+            decoder->_state = CHUNKED_IN_CHUNK_DATA;
+        /* fallthru */
+        case CHUNKED_IN_CHUNK_DATA: {
+            size_t avail = bufsz - src;
+            if (avail < decoder->bytes_left_in_chunk) {
+                if (dst != src)
+                    memmove(buf + dst, buf + src, avail);
+                src += avail;
+                dst += avail;
+                decoder->bytes_left_in_chunk -= avail;
+                goto Exit;
+            }
+            if (dst != src)
+                memmove(buf + dst, buf + src, decoder->bytes_left_in_chunk);
+            src += decoder->bytes_left_in_chunk;
+            dst += decoder->bytes_left_in_chunk;
+            decoder->bytes_left_in_chunk = 0;
+            decoder->_state = CHUNKED_IN_CHUNK_CRLF;
+        }
+        /* fallthru */
+        case CHUNKED_IN_CHUNK_CRLF:
+            for (;; ++src) {
+                if (src == bufsz)
+                    goto Exit;
+                if (buf[src] != '\015')
+                    break;
+            }
+            if (buf[src] != '\012') {
+                ret = -1;
+                goto Exit;
+            }
+            ++src;
+            decoder->_state = CHUNKED_IN_CHUNK_SIZE;
+            break;
+        case CHUNKED_IN_TRAILERS_LINE_HEAD:
+            for (;; ++src) {
+                if (src == bufsz)
+                    goto Exit;
+                if (buf[src] != '\015')
+                    break;
+            }
+            if (buf[src++] == '\012')
+                goto Complete;
+            decoder->_state = CHUNKED_IN_TRAILERS_LINE_MIDDLE;
+        /* fallthru */
+        case CHUNKED_IN_TRAILERS_LINE_MIDDLE:
+            for (;; ++src) {
+                if (src == bufsz)
+                    goto Exit;
+                if (buf[src] == '\012')
+                    break;
+            }
+            ++src;
+            decoder->_state = CHUNKED_IN_TRAILERS_LINE_HEAD;
+            break;
+        default:
+            assert(!"decoder is corrupt");
+        }
+    }
+
+Complete:
+    ret = bufsz - src;
+Exit:
+    if (dst != src)
+        memmove(buf + dst, buf + src, bufsz - src);
+    *_bufsz = dst;
+    return ret;
+}
+
+int phr_decode_chunked_is_in_data(struct phr_chunked_decoder *decoder)
+{
+    return decoder->_state == CHUNKED_IN_CHUNK_DATA;
+}
+
+#undef CHECK_EOF
+#undef EXPECT_CHAR
+#undef ADVANCE_TOKEN
diff --git a/plugins/picohttpparser/picohttpparser.h b/plugins/picohttpparser/picohttpparser.h
new file mode 100644
index 00000000..0849f844
--- /dev/null
+++ b/plugins/picohttpparser/picohttpparser.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2009-2014 Kazuho Oku, Tokuhiro Matsuno, Daisuke Murase,
+ *                         Shigeo Mitsunari
+ *
+ * The software is licensed under either the MIT License (below) or the Perl
+ * license.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef picohttpparser_h
+#define picohttpparser_h
+
+#include <sys/types.h>
+
+#ifdef _MSC_VER
+#define ssize_t intptr_t
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* contains name and value of a header (name == NULL if is a continuing line
+ * of a multiline header */
+struct phr_header {
+    const char *name;
+    size_t name_len;
+    const char *value;
+    size_t value_len;
+};
+
+/* returns number of bytes consumed if successful, -2 if request is partial,
+ * -1 if failed */
+int phr_parse_request(const char *buf, size_t len, const char **method, size_t *method_len, const char **path, size_t *path_len,
+                      int *minor_version, struct phr_header *headers, size_t *num_headers, size_t last_len);
+
+/* ditto */
+int phr_parse_response(const char *_buf, size_t len, int *minor_version, int *status, const char **msg, size_t *msg_len,
+                       struct phr_header *headers, size_t *num_headers, size_t last_len);
+
+/* ditto */
+int phr_parse_headers(const char *buf, size_t len, struct phr_header *headers, size_t *num_headers, size_t last_len);
+
+/* should be zero-filled before start */
+struct phr_chunked_decoder {
+    size_t bytes_left_in_chunk; /* number of bytes left in current chunk */
+    char consume_trailer;       /* if trailing headers should be consumed */
+    char _hex_count;
+    char _state;
+};
+
+/* the function rewrites the buffer given as (buf, bufsz) removing the chunked-
+ * encoding headers.  When the function returns without an error, bufsz is
+ * updated to the length of the decoded data available.  Applications should
+ * repeatedly call the function while it returns -2 (incomplete) every time
+ * supplying newly arrived data.  If the end of the chunked-encoded data is
+ * found, the function returns a non-negative number indicating the number of
+ * octets left undecoded at the tail of the supplied buffer.  Returns -1 on
+ * error.
+ */
+ssize_t phr_decode_chunked(struct phr_chunked_decoder *decoder, char *buf, size_t *bufsz);
+
+/* returns if the chunked decoder is in middle of chunked data */
+int phr_decode_chunked_is_in_data(struct phr_chunked_decoder *decoder);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/plugins/sslutils.c b/plugins/sslutils.c
index e38947e3..14f6579d 100644
--- a/plugins/sslutils.c
+++ b/plugins/sslutils.c
@@ -1,29 +1,29 @@
 /*****************************************************************************
-* 
+*
 * Monitoring Plugins SSL utilities
-* 
+*
 * License: GPL
 * Copyright (c) 2005-2010 Monitoring Plugins Development Team
-* 
+*
 * Description:
-* 
+*
 * This file contains common functions for plugins that require SSL.
-* 
+*
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
-* 
+*
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
-* 
+*
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-* 
-* 
+*
+*
 *****************************************************************************/
 
 #define MAX_CN_LENGTH 256
@@ -193,12 +193,22 @@ int np_net_ssl_read(void *buf, int num) {
 
 int np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit){
 #  ifdef USE_OPENSSL
-	X509 *certificate=NULL;
+	X509 *certificate = NULL;
+	certificate=SSL_get_peer_certificate(s);
+	return(np_net_ssl_check_certificate(certificate, days_till_exp_warn, days_till_exp_crit));
+#  else /* ifndef USE_OPENSSL */
+	printf("%s\n", _("WARNING - Plugin does not support checking certificates."));
+	return STATE_WARNING;
+#  endif /* USE_OPENSSL */
+}
+
+int np_net_ssl_check_certificate(X509 *certificate, int days_till_exp_warn, int days_till_exp_crit){
+#  ifdef USE_OPENSSL
 	X509_NAME *subj=NULL;
 	char timestamp[50] = "";
 	char cn[MAX_CN_LENGTH]= "";
 	char *tz;
-	
+
 	int cnlen =-1;
 	int status=STATE_UNKNOWN;
 
@@ -210,7 +220,6 @@ int np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit){
 	int time_remaining;
 	time_t tm_t;
 
-	certificate=SSL_get_peer_certificate(s);
 	if (!certificate) {
 		printf("%s\n",_("CRITICAL - Cannot retrieve server certificate."));
 		return STATE_CRITICAL;
diff --git a/plugins/t/check_curl.t b/plugins/t/check_curl.t
new file mode 100644
index 00000000..4bff538a
--- /dev/null
+++ b/plugins/t/check_curl.t
@@ -0,0 +1,199 @@
+#! /usr/bin/perl -w -I ..
+#
+# HyperText Transfer Protocol (HTTP) Test via check_http
+#
+#
+
+use strict;
+use Test::More;
+use POSIX qw/mktime strftime/;
+use NPTest;
+
+plan tests => 57;
+
+my $successOutput = '/OK.*HTTP.*second/';
+
+my $res;
+my $plugin = 'check_http';
+$plugin    = 'check_curl' if $0 =~ m/check_curl/mx;
+
+my $host_tcp_http      = getTestParameter("NP_HOST_TCP_HTTP", "A host providing the HTTP Service (a web server)", "localhost");
+my $host_tls_http      = getTestParameter("NP_HOST_TLS_HTTP", "A host providing the HTTPS Service (a tls web server)", "localhost");
+my $host_tls_cert      = getTestParameter("NP_HOST_TLS_CERT", "the common name of the certificate.", "localhost");
+my $host_nonresponsive = getTestParameter("NP_HOST_NONRESPONSIVE", "The hostname of system not responsive to network requests", "10.0.0.1");
+my $hostname_invalid   = getTestParameter("NP_HOSTNAME_INVALID", "An invalid (not known to DNS) hostname", "nosuchhost");
+my $internet_access    = getTestParameter("NP_INTERNET_ACCESS", "Is this system directly connected to the internet?", "yes");
+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 $faketime = -x '/usr/bin/faketime' ? 1 : 0;
+
+
+$res = NPTest->testCmd(
+	"./$plugin $host_tcp_http -wt 300 -ct 600"
+	);
+cmp_ok( $res->return_code, '==', 0, "Webserver $host_tcp_http responded" );
+like( $res->output, $successOutput, "Output OK" );
+
+$res = NPTest->testCmd(
+	"./$plugin $host_tcp_http -wt 300 -ct 600 -v -v -v -k 'bob:there' -k 'carl:frown'"
+	);
+like( $res->output, '/bob:there\r\ncarl:frown\r\n/', "Got headers with multiple -k options" );
+
+$res = NPTest->testCmd(
+	"./$plugin $host_nonresponsive -wt 1 -ct 2 -t 3"
+	);
+cmp_ok( $res->return_code, '==', 2, "Webserver $host_nonresponsive not responding" );
+# was CRITICAL only, but both check_curl and check_http print HTTP CRITICAL (puzzle?!)
+cmp_ok( $res->output, 'eq', "HTTP CRITICAL - Invalid HTTP response received from host on port 80: cURL returned 28 - Timeout was reached", "Output OK");
+
+$res = NPTest->testCmd(
+	"./$plugin $hostname_invalid -wt 1 -ct 2"
+	);
+cmp_ok( $res->return_code, '==', 2, "Webserver $hostname_invalid not valid" );
+# The first part of the message comes from the OS catalogue, so cannot check this.
+# On Debian, it is Name or service not known, on Darwin, it is No address associated with nodename
+# Is also possible to get a socket timeout if DNS is not responding fast enough
+# cURL gives us consistent strings from it's own 'lib/strerror.c'
+like( $res->output, "/cURL returned 6 - Couldn't resolve host name/", "Output OK");
+
+# host header checks
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http");
+like( $res->output, '/^Host: '.$host_tcp_http.'\s*$/ms', "Host Header OK" );
+like( $res->output, '/CURLOPT_URL: http:\/\/'.$host_tcp_http.':80\//ms', "Url OK" );
+
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http -p 80");
+like( $res->output, '/^Host: '.$host_tcp_http.'\s*$/ms', "Host Header OK" );
+like( $res->output, '/CURLOPT_URL: http:\/\/'.$host_tcp_http.':80\//ms', "Url OK" );
+
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http:8080 -p 80");
+like( $res->output, '/^Host: '.$host_tcp_http.':8080\s*$/ms', "Host Header OK" );
+like( $res->output, '/CURLOPT_URL: http:\/\/'.$host_tcp_http.':80\//ms', "Url OK" );
+
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http:8080 -p 80");
+like( $res->output, '/^Host: '.$host_tcp_http.':8080\s*$/ms', "Host Header OK" );
+like( $res->output, '/CURLOPT_URL: http:\/\/'.$host_tcp_http.':80\//ms', "Url OK" );
+
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http:8080 -p 80 -k 'Host: testhost:8001'");
+like( $res->output, '/^Host: testhost:8001\s*$/ms', "Host Header OK" );
+like( $res->output, '/CURLOPT_URL: http:\/\/'.$host_tcp_http.':80\//ms', "Url OK" );
+
+$res = NPTest->testCmd("./$plugin -v -I $host_tcp_http -p 80 -k 'Host: testhost:8001'");
+like( $res->output, '/^Host: testhost:8001\s*$/ms', "Host Header OK" );
+like( $res->output, '/CURLOPT_URL: http:\/\/'.$host_tcp_http.':80\//ms', "Url OK" );
+
+SKIP: {
+        skip "No internet access", 3 if $internet_access eq "no";
+
+        $res = NPTest->testCmd("./$plugin -v -H $host_tls_http -S");
+        like( $res->output, '/^Host: '.$host_tls_http.'\s*$/ms', "Host Header OK" );
+
+        $res = NPTest->testCmd("./$plugin -v -H $host_tls_http:8080 -S -p 443");
+        like( $res->output, '/^Host: '.$host_tls_http.':8080\s*$/ms', "Host Header OK" );
+
+        $res = NPTest->testCmd("./$plugin -v -H $host_tls_http:443 -S -p 443");
+        like( $res->output, '/^Host: '.$host_tls_http.'\s*$/ms', "Host Header OK" );
+};
+
+SKIP: {
+        skip "No host serving monitoring in index file", 7 unless $host_tcp_http2;
+
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'monitoring'" );
+        cmp_ok( $res->return_code, "==", 0, "Got a reference to 'monitoring'");
+
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'mONiTORing'" );
+        cmp_ok( $res->return_code, "==", 2, "Not got 'mONiTORing'");
+        like ( $res->output, "/pattern not found/", "Error message says 'pattern not found'");
+
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -R 'mONiTORing'" );
+        cmp_ok( $res->return_code, "==", 0, "But case insensitive doesn't mind 'mONiTORing'");
+
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'monitoring' --invert-regex" );
+        cmp_ok( $res->return_code, "==", 2, "Invert results work when found");
+        like ( $res->output, "/pattern found/", "Error message says 'pattern found'");
+
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'mONiTORing' --invert-regex" );
+        cmp_ok( $res->return_code, "==", 0, "And also when not found");
+}
+SKIP: {
+        skip "No internet access", 16 if $internet_access eq "no";
+
+        $res = NPTest->testCmd(
+                "./$plugin --ssl $host_tls_http"
+                );
+        cmp_ok( $res->return_code, '==', 0, "Can read https for $host_tls_http" );
+
+        $res = NPTest->testCmd( "./$plugin -C 1 --ssl $host_tls_http" );
+        cmp_ok( $res->return_code, '==', 0, "Checking certificate for $host_tls_http");
+        like  ( $res->output, "/Certificate '$host_tls_cert' will expire on/", "Output OK" );
+        my $saved_cert_output = $res->output;
+
+        $res = NPTest->testCmd( "./$plugin -C 8000,1 --ssl $host_tls_http" );
+        cmp_ok( $res->return_code, '==', 1, "Checking certificate for $host_tls_http");
+        like  ( $res->output, qr/WARNING - Certificate '$host_tls_cert' expires in \d+ day/, "Output Warning" );
+
+        $res = NPTest->testCmd( "./$plugin $host_tls_http -C 1" );
+        is( $res->return_code, 0, "Old syntax for cert checking okay" );
+        is( $res->output, $saved_cert_output, "Same output as new syntax" );
+
+        $res = NPTest->testCmd( "./$plugin -H $host_tls_http -C 1" );
+        is( $res->return_code, 0, "Updated syntax for cert checking okay" );
+        is( $res->output, $saved_cert_output, "Same output as new syntax" );
+
+        $res = NPTest->testCmd( "./$plugin -C 1 $host_tls_http" );
+        cmp_ok( $res->output, 'eq', $saved_cert_output, "--ssl option automatically added");
+
+        $res = NPTest->testCmd( "./$plugin $host_tls_http -C 1" );
+        cmp_ok( $res->output, 'eq', $saved_cert_output, "Old syntax for cert checking still works");
+
+        # run some certificate checks with faketime
+        SKIP: {
+                skip "No faketime binary found", 12 if !$faketime;
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC ./$plugin -C 1 $host_tls_http");
+                like($res->output, qr/OK - Certificate '$host_tls_cert' will expire on/, "Catch cert output");
+                is( $res->return_code, 0, "Catch cert output exit code" );
+                my($mon,$day,$hour,$min,$sec,$year) = ($res->output =~ /(\w+)\s+(\d+)\s+(\d+):(\d+):(\d+)\s+(\d+)/);
+                if(!defined $year) {
+                    die("parsing date failed from: ".$res->output);
+                }
+                my $months = {'Jan' => 0, 'Feb' => 1, 'Mar' => 2, 'Apr' => 3, 'May' => 4, 'Jun' => 5, 'Jul' => 6, 'Aug' => 7, 'Sep' => 8, 'Oct' => 9, 'Nov' => 10, 'Dec' => 11};
+                my $ts   = mktime($sec, $min, $hour, $day, $months->{$mon}, $year-1900);
+                my $time = strftime("%Y-%m-%d %H:%M:%S", localtime($ts));
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts))."' ./$plugin -C 1 $host_tls_http");
+                like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' just expired/, "Output on expire date");
+                is( $res->return_code, 2, "Output on expire date" );
+
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-1))."' ./$plugin -C 1 $host_tls_http");
+                like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expires in 0 minutes/, "cert expires in 1 second output");
+                is( $res->return_code, 2, "cert expires in 1 second exit code" );
+
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-120))."' ./$plugin -C 1 $host_tls_http");
+                like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expires in 2 minutes/, "cert expires in 2 minutes output");
+                is( $res->return_code, 2, "cert expires in 2 minutes exit code" );
+
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-7200))."' ./$plugin -C 1 $host_tls_http");
+                like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expires in 2 hours/, "cert expires in 2 hours output");
+                is( $res->return_code, 2, "cert expires in 2 hours exit code" );
+
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts+1))."' ./$plugin -C 1 $host_tls_http");
+                like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expired on/, "Certificate expired output");
+                is( $res->return_code, 2, "Certificate expired exit code" );
+        };
+
+        $res = NPTest->testCmd( "./$plugin --ssl $host_tls_http -E" );
+        like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
+        like  ( $res->output, '/time_ssl=[\d\.]+/', 'Extended Performance Data SSL Output OK' );
+
+        $res = NPTest->testCmd(
+                "./$plugin --ssl -H www.e-paycobalt.com"
+                );
+        cmp_ok( $res->return_code, "==", 0, "Can read https for www.e-paycobalt.com (uses AES certificate)" );
+
+
+        $res = NPTest->testCmd( "./$plugin -H www.mozilla.com -u /firefox -f follow" );
+        is( $res->return_code, 0, "Redirection based on location is okay");
+
+        $res = NPTest->testCmd( "./$plugin -H www.mozilla.com --extended-perfdata" );
+        like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
+}
diff --git a/plugins/t/check_http.t b/plugins/t/check_http.t
index b3760ebe..e92681e9 100644
--- a/plugins/t/check_http.t
+++ b/plugins/t/check_http.t
@@ -14,6 +14,8 @@ plan tests => 50;
 my $successOutput = '/OK.*HTTP.*second/';
 
 my $res;
+my $plugin = 'check_http';
+$plugin    = 'check_curl' if $0 =~ m/check_curl/mx;
 
 my $host_tcp_http      = getTestParameter("NP_HOST_TCP_HTTP", "A host providing the HTTP Service (a web server)", "localhost");
 my $host_tls_http      = getTestParameter("NP_HOST_TLS_HTTP", "A host providing the HTTPS Service (a tls web server)", "localhost");
@@ -29,24 +31,24 @@ my $faketime = -x '/usr/bin/faketime' ? 1 : 0;
 
 
 $res = NPTest->testCmd(
-	"./check_http $host_tcp_http -wt 300 -ct 600"
+	"./$plugin $host_tcp_http -wt 300 -ct 600"
 	);
 cmp_ok( $res->return_code, '==', 0, "Webserver $host_tcp_http responded" );
 like( $res->output, $successOutput, "Output OK" );
 
 $res = NPTest->testCmd(
-	"./check_http $host_tcp_http -wt 300 -ct 600 -v -v -v -k 'bob:there' -k 'carl:frown'"
+	"./$plugin $host_tcp_http -wt 300 -ct 600 -v -v -v -k 'bob:there' -k 'carl:frown'"
 	);
 like( $res->output, '/bob:there\r\ncarl:frown\r\n/', "Got headers with multiple -k options" );
 
 $res = NPTest->testCmd(
-	"./check_http $host_nonresponsive -wt 1 -ct 2 -t 3"
+	"./$plugin $host_nonresponsive -wt 1 -ct 2 -t 3"
 	);
 cmp_ok( $res->return_code, '==', 2, "Webserver $host_nonresponsive not responding" );
 cmp_ok( $res->output, 'eq', "CRITICAL - Socket timeout after 3 seconds", "Output OK");
 
 $res = NPTest->testCmd(
-	"./check_http $hostname_invalid -wt 1 -ct 2"
+	"./$plugin $hostname_invalid -wt 1 -ct 2"
 	);
 cmp_ok( $res->return_code, '==', 2, "Webserver $hostname_invalid not valid" );
 # The first part of the message comes from the OS catalogue, so cannot check this.
@@ -55,86 +57,86 @@ cmp_ok( $res->return_code, '==', 2, "Webserver $hostname_invalid not valid" );
 like( $res->output, "/Unable to open TCP socket|Socket timeout after/", "Output OK");
 
 # host header checks
-$res = NPTest->testCmd("./check_http -v -H $host_tcp_http");
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http");
 like( $res->output, '/^Host: '.$host_tcp_http.'\s*$/ms', "Host Header OK" );
 
-$res = NPTest->testCmd("./check_http -v -H $host_tcp_http -p 80");
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http -p 80");
 like( $res->output, '/^Host: '.$host_tcp_http.'\s*$/ms', "Host Header OK" );
 
-$res = NPTest->testCmd("./check_http -v -H $host_tcp_http:8080 -p 80");
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http:8080 -p 80");
 like( $res->output, '/^Host: '.$host_tcp_http.':8080\s*$/ms', "Host Header OK" );
 
-$res = NPTest->testCmd("./check_http -v -H $host_tcp_http:8080 -p 80");
+$res = NPTest->testCmd("./$plugin -v -H $host_tcp_http:8080 -p 80");
 like( $res->output, '/^Host: '.$host_tcp_http.':8080\s*$/ms', "Host Header OK" );
 
 SKIP: {
         skip "No internet access", 3 if $internet_access eq "no";
 
-        $res = NPTest->testCmd("./check_http -v -H $host_tls_http -S");
+        $res = NPTest->testCmd("./$plugin -v -H $host_tls_http -S");
         like( $res->output, '/^Host: '.$host_tls_http.'\s*$/ms', "Host Header OK" );
 
-        $res = NPTest->testCmd("./check_http -v -H $host_tls_http:8080 -S -p 443");
+        $res = NPTest->testCmd("./$plugin -v -H $host_tls_http:8080 -S -p 443");
         like( $res->output, '/^Host: '.$host_tls_http.':8080\s*$/ms', "Host Header OK" );
 
-        $res = NPTest->testCmd("./check_http -v -H $host_tls_http:443 -S -p 443");
+        $res = NPTest->testCmd("./$plugin -v -H $host_tls_http:443 -S -p 443");
         like( $res->output, '/^Host: '.$host_tls_http.'\s*$/ms', "Host Header OK" );
 };
 
 SKIP: {
         skip "No host serving monitoring in index file", 7 unless $host_tcp_http2;
 
-        $res = NPTest->testCmd( "./check_http -H $host_tcp_http2 -r 'monitoring'" );
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'monitoring'" );
         cmp_ok( $res->return_code, "==", 0, "Got a reference to 'monitoring'");
 
-        $res = NPTest->testCmd( "./check_http -H $host_tcp_http2 -r 'mONiTORing'" );
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'mONiTORing'" );
         cmp_ok( $res->return_code, "==", 2, "Not got 'mONiTORing'");
         like ( $res->output, "/pattern not found/", "Error message says 'pattern not found'");
 
-        $res = NPTest->testCmd( "./check_http -H $host_tcp_http2 -R 'mONiTORing'" );
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -R 'mONiTORing'" );
         cmp_ok( $res->return_code, "==", 0, "But case insensitive doesn't mind 'mONiTORing'");
 
-        $res = NPTest->testCmd( "./check_http -H $host_tcp_http2 -r 'monitoring' --invert-regex" );
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'monitoring' --invert-regex" );
         cmp_ok( $res->return_code, "==", 2, "Invert results work when found");
         like ( $res->output, "/pattern found/", "Error message says 'pattern found'");
 
-        $res = NPTest->testCmd( "./check_http -H $host_tcp_http2 -r 'mONiTORing' --invert-regex" );
+        $res = NPTest->testCmd( "./$plugin -H $host_tcp_http2 -r 'mONiTORing' --invert-regex" );
         cmp_ok( $res->return_code, "==", 0, "And also when not found");
 }
 SKIP: {
         skip "No internet access", 16 if $internet_access eq "no";
 
         $res = NPTest->testCmd(
-                "./check_http --ssl $host_tls_http"
+                "./$plugin --ssl $host_tls_http"
                 );
         cmp_ok( $res->return_code, '==', 0, "Can read https for $host_tls_http" );
 
-        $res = NPTest->testCmd( "./check_http -C 1 --ssl $host_tls_http" );
+        $res = NPTest->testCmd( "./$plugin -C 1 --ssl $host_tls_http" );
         cmp_ok( $res->return_code, '==', 0, "Checking certificate for $host_tls_http");
         like  ( $res->output, "/Certificate '$host_tls_cert' will expire on/", "Output OK" );
         my $saved_cert_output = $res->output;
 
-        $res = NPTest->testCmd( "./check_http -C 8000,1 --ssl $host_tls_http" );
+        $res = NPTest->testCmd( "./$plugin -C 8000,1 --ssl $host_tls_http" );
         cmp_ok( $res->return_code, '==', 1, "Checking certificate for $host_tls_http");
         like  ( $res->output, qr/WARNING - Certificate '$host_tls_cert' expires in \d+ day/, "Output Warning" );
 
-        $res = NPTest->testCmd( "./check_http $host_tls_http -C 1" );
+        $res = NPTest->testCmd( "./$plugin $host_tls_http -C 1" );
         is( $res->return_code, 0, "Old syntax for cert checking okay" );
         is( $res->output, $saved_cert_output, "Same output as new syntax" );
 
-        $res = NPTest->testCmd( "./check_http -H $host_tls_http -C 1" );
+        $res = NPTest->testCmd( "./$plugin -H $host_tls_http -C 1" );
         is( $res->return_code, 0, "Updated syntax for cert checking okay" );
         is( $res->output, $saved_cert_output, "Same output as new syntax" );
 
-        $res = NPTest->testCmd( "./check_http -C 1 $host_tls_http" );
+        $res = NPTest->testCmd( "./$plugin -C 1 $host_tls_http" );
         cmp_ok( $res->output, 'eq', $saved_cert_output, "--ssl option automatically added");
 
-        $res = NPTest->testCmd( "./check_http $host_tls_http -C 1" );
+        $res = NPTest->testCmd( "./$plugin $host_tls_http -C 1" );
         cmp_ok( $res->output, 'eq', $saved_cert_output, "Old syntax for cert checking still works");
 
         # run some certificate checks with faketime
         SKIP: {
-                skip "No faketime binary found", 7 if !$faketime;
-                $res = NPTest->testCmd("LC_TIME=C TZ=UTC ./check_http -C 1 $host_tls_http");
+                skip "No faketime binary found", 12 if !$faketime;
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC ./$plugin -C 1 $host_tls_http");
                 like($res->output, qr/OK - Certificate '$host_tls_cert' will expire on/, "Catch cert output");
                 is( $res->return_code, 0, "Catch cert output exit code" );
                 my($mon,$day,$hour,$min,$sec,$year) = ($res->output =~ /(\w+)\s+(\d+)\s+(\d+):(\d+):(\d+)\s+(\d+)/);
@@ -144,51 +146,51 @@ SKIP: {
                 my $months = {'Jan' => 0, 'Feb' => 1, 'Mar' => 2, 'Apr' => 3, 'May' => 4, 'Jun' => 5, 'Jul' => 6, 'Aug' => 7, 'Sep' => 8, 'Oct' => 9, 'Nov' => 10, 'Dec' => 11};
                 my $ts   = mktime($sec, $min, $hour, $day, $months->{$mon}, $year-1900);
                 my $time = strftime("%Y-%m-%d %H:%M:%S", localtime($ts));
-                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts))."' ./check_http -C 1 $host_tls_http");
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts))."' ./$plugin -C 1 $host_tls_http");
                 like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' just expired/, "Output on expire date");
 
-                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-1))."' ./check_http -C 1 $host_tls_http");
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-1))."' ./$plugin -C 1 $host_tls_http");
                 like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expires in 0 minutes/, "cert expires in 1 second output");
 
-                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-120))."' ./check_http -C 1 $host_tls_http");
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-120))."' ./$plugin -C 1 $host_tls_http");
                 like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expires in 2 minutes/, "cert expires in 2 minutes output");
 
-                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-7200))."' ./check_http -C 1 $host_tls_http");
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts-7200))."' ./$plugin -C 1 $host_tls_http");
                 like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expires in 2 hours/, "cert expires in 2 hours output");
 
-                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts+1))."' ./check_http -C 1 $host_tls_http");
+                $res = NPTest->testCmd("LC_TIME=C TZ=UTC faketime -f '".strftime("%Y-%m-%d %H:%M:%S", localtime($ts+1))."' ./$plugin -C 1 $host_tls_http");
                 like($res->output, qr/CRITICAL - Certificate '$host_tls_cert' expired on/, "Certificate expired output");
         };
 
-        $res = NPTest->testCmd( "./check_http --ssl $host_tls_http -E" );
+        $res = NPTest->testCmd( "./$plugin --ssl $host_tls_http -E" );
         like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
         like  ( $res->output, '/time_ssl=[\d\.]+/', 'Extended Performance Data SSL Output OK' );
 
         $res = NPTest->testCmd(
-                "./check_http --ssl -H www.e-paycobalt.com"
+                "./$plugin --ssl -H www.e-paycobalt.com"
                 );
         cmp_ok( $res->return_code, "==", 0, "Can read https for www.e-paycobalt.com (uses AES certificate)" );
 
 
-        $res = NPTest->testCmd( "./check_http -H www.mozilla.com -u /firefox -f follow" );
+        $res = NPTest->testCmd( "./$plugin -H www.mozilla.com -u /firefox -f follow" );
         is( $res->return_code, 0, "Redirection based on location is okay");
 
-        $res = NPTest->testCmd( "./check_http -H www.mozilla.com --extended-perfdata" );
+        $res = NPTest->testCmd( "./$plugin -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");
+        $res = NPTest->testCmd( "./$plugin -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");
+        $res = NPTest->testCmd( "./$plugin -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");
+        $res = NPTest->testCmd( "./$plugin -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/plugins/tests/check_curl.t b/plugins/tests/check_curl.t
new file mode 100755
index 00000000..1afbe4bb
--- /dev/null
+++ b/plugins/tests/check_curl.t
@@ -0,0 +1,498 @@
+#! /usr/bin/perl -w -I ..
+#
+# Test check_http by having an actual HTTP server running
+#
+# To create the https server certificate:
+# openssl req -new -x509 -keyout server-key.pem -out server-cert.pem -days 3650 -nodes
+# to create a new expired certificate:
+# faketime '2008-01-01 12:00:00' openssl req -new -x509 -keyout expired-key.pem -out expired-cert.pem -days 1 -nodes
+# Country Name (2 letter code) [AU]:DE
+# State or Province Name (full name) [Some-State]:Bavaria
+# Locality Name (eg, city) []:Munich
+# Organization Name (eg, company) [Internet Widgits Pty Ltd]:Monitoring Plugins
+# Organizational Unit Name (eg, section) []:
+# Common Name (e.g. server FQDN or YOUR name) []:Monitoring Plugins
+# Email Address []:devel@monitoring-plugins.org
+
+use strict;
+use Test::More;
+use NPTest;
+use FindBin qw($Bin);
+
+$ENV{'LC_TIME'} = "C";
+
+my $common_tests = 70;
+my $ssl_only_tests = 8;
+# Check that all dependent modules are available
+eval "use HTTP::Daemon 6.01;";
+plan skip_all => 'HTTP::Daemon >= 6.01 required' if $@;
+eval {
+	require HTTP::Status;
+	require HTTP::Response;
+};
+
+my $plugin = 'check_http';
+$plugin    = 'check_curl' if $0 =~ m/check_curl/mx;
+
+# look for libcurl version to see if some advanced checks are possible (>= 7.49.0)
+my $advanced_checks = 12;
+my $use_advanced_checks = 0;
+my $required_version = '7.49.0';
+my $virtual_host = 'www.somefunnyhost.com';
+my $virtual_port = 42;
+my $curl_version = '';
+open (my $fh, '-|', "./$plugin --version") or die;
+while (<$fh>) {
+	if (m{libcurl/([\d.]+)\s}) {
+		$curl_version = $1;
+		last;
+	}
+}
+close ($fh);
+if ($curl_version) {
+	my ($major, $minor, $release) = split (/\./, $curl_version);
+	my ($req_major, $req_minor, $req_release) = split (/\./, $required_version);
+	my $check = ($major <=> $req_major or $minor <=> $req_minor or $release <=> $req_release);
+	if ($check >= 0) {
+		$use_advanced_checks = 1;
+		print "Found libcurl $major.$minor.$release. Using advanced checks\n";
+	}
+}
+
+if ($@) {
+	plan skip_all => "Missing required module for test: $@";
+} else {
+	if (-x "./$plugin") {
+		plan tests => $common_tests * 2 + $ssl_only_tests + $advanced_checks;
+	} else {
+		plan skip_all => "No $plugin compiled";
+	}
+}
+
+my $servers = { http => 0 };	# HTTP::Daemon should always be available
+eval { require HTTP::Daemon::SSL };
+if ($@) {
+	diag "Cannot load HTTP::Daemon::SSL: $@";
+} else {
+	$servers->{https} = 0;
+}
+
+# set a fixed version, so the header size doesn't vary
+$HTTP::Daemon::VERSION = "1.00";
+
+my $port_http = 50000 + int(rand(1000));
+my $port_https = $port_http + 1;
+my $port_https_expired = $port_http + 2;
+
+# This array keeps sockets around for implementing timeouts
+my @persist;
+
+# Start up all servers
+my @pids;
+my $pid = fork();
+if ($pid) {
+	# Parent
+	push @pids, $pid;
+	if (exists $servers->{https}) {
+		# Fork a normal HTTPS server
+		$pid = fork();
+		if ($pid) {
+			# Parent
+			push @pids, $pid;
+			# Fork an expired cert server
+			$pid = fork();
+			if ($pid) {
+				push @pids, $pid;
+			} else {
+				my $d = HTTP::Daemon::SSL->new(
+					LocalPort => $port_https_expired,
+					LocalAddr => "127.0.0.1",
+					SSL_cert_file => "$Bin/certs/expired-cert.pem",
+					SSL_key_file => "$Bin/certs/expired-key.pem",
+				) || die;
+				print "Please contact https expired at: <URL:", $d->url, ">\n";
+				run_server( $d );
+				exit;
+			}
+		} else {
+			my $d = HTTP::Daemon::SSL->new(
+				LocalPort => $port_https,
+				LocalAddr => "127.0.0.1",
+				SSL_cert_file => "$Bin/certs/server-cert.pem",
+				SSL_key_file => "$Bin/certs/server-key.pem",
+			) || die;
+			print "Please contact https at: <URL:", $d->url, ">\n";
+			run_server( $d );
+			exit;
+		}
+	}
+	# give our webservers some time to startup
+	sleep(1);
+} else {
+	# Child
+	#print "child\n";
+	my $d = HTTP::Daemon->new(
+		LocalPort => $port_http,
+		LocalAddr => "127.0.0.1",
+	) || die;
+	print "Please contact http at: <URL:", $d->url, ">\n";
+	run_server( $d );
+	exit;
+}
+
+# Run the same server on http and https
+sub run_server {
+	my $d = shift;
+	MAINLOOP: while (my $c = $d->accept ) {
+		while (my $r = $c->get_request) {
+			if ($r->method eq "GET" and $r->url->path =~ m^/statuscode/(\d+)^) {
+				$c->send_basic_header($1);
+				$c->send_crlf;
+			} elsif ($r->method eq "GET" and $r->url->path =~ m^/file/(.*)^) {
+				$c->send_basic_header;
+				$c->send_crlf;
+				$c->send_file_response("$Bin/var/$1");
+			} elsif ($r->method eq "GET" and $r->url->path eq "/slow") {
+				$c->send_basic_header;
+				$c->send_crlf;
+				sleep 1;
+				$c->send_response("slow");
+			} elsif ($r->url->path eq "/method") {
+				if ($r->method eq "DELETE") {
+					$c->send_error(HTTP::Status->RC_METHOD_NOT_ALLOWED);
+				} elsif ($r->method eq "foo") {
+					$c->send_error(HTTP::Status->RC_NOT_IMPLEMENTED);
+				} else {
+					$c->send_status_line(200, $r->method);
+				}
+			} elsif ($r->url->path eq "/postdata") {
+				$c->send_basic_header;
+				$c->send_crlf;
+				$c->send_response($r->method.":".$r->content);
+			} elsif ($r->url->path eq "/redirect") {
+				$c->send_redirect( "/redirect2" );
+			} elsif ($r->url->path eq "/redir_external") {
+				$c->send_redirect(($d->isa('HTTP::Daemon::SSL') ? "https" : "http") . "://169.254.169.254/redirect2" );
+			} elsif ($r->url->path eq "/redirect2") {
+				$c->send_basic_header;
+				$c->send_crlf;
+				$c->send_response(HTTP::Response->new( 200, 'OK', undef, 'redirected' ));
+			} elsif ($r->url->path eq "/redir_timeout") {
+				$c->send_redirect( "/timeout" );
+			} elsif ($r->url->path eq "/timeout") {
+				# Keep $c from being destroyed, but prevent severe leaks
+				unshift @persist, $c;
+				delete($persist[1000]);
+				next MAINLOOP;
+			} elsif ($r->url->path eq "/header_check") {
+				$c->send_basic_header;
+				$c->send_header('foo');
+				$c->send_crlf;
+			} elsif ($r->url->path eq "/virtual_port") {
+				# return sent Host header
+				$c->send_basic_header;
+				$c->send_crlf;
+				$c->send_response(HTTP::Response->new( 200, 'OK', undef, $r->header ('Host')));
+			} else {
+				$c->send_error(HTTP::Status->RC_FORBIDDEN);
+			}
+			$c->close;
+		}
+	}
+}
+
+END {
+	foreach my $pid (@pids) {
+		if ($pid) { print "Killing $pid\n"; kill "INT", $pid }
+	}
+};
+
+if ($ARGV[0] && $ARGV[0] eq "-d") {
+	while (1) {
+		sleep 100;
+	}
+}
+
+my $result;
+my $command = "./$plugin -H 127.0.0.1";
+
+run_common_tests( { command => "$command -p $port_http" } );
+SKIP: {
+	skip "HTTP::Daemon::SSL not installed", $common_tests + $ssl_only_tests if ! exists $servers->{https};
+	run_common_tests( { command => "$command -p $port_https", ssl => 1 } );
+
+	$result = NPTest->testCmd( "$command -p $port_https -S -C 14" );
+	is( $result->return_code, 0, "$command -p $port_https -S -C 14" );
+	is( $result->output, "OK - Certificate 'Monitoring Plugins' will expire on Fri Feb 16 15:31:44 2029 +0000.", "output ok" );
+
+	$result = NPTest->testCmd( "$command -p $port_https -S -C 14000" );
+	is( $result->return_code, 1, "$command -p $port_https -S -C 14000" );
+	like( $result->output, '/WARNING - Certificate \'Monitoring Plugins\' expires in \d+ day\(s\) \(Fri Feb 16 15:31:44 2029 \+0000\)./', "output ok" );
+
+	# Expired cert tests
+	$result = NPTest->testCmd( "$command -p $port_https -S -C 13960,14000" );
+	is( $result->return_code, 2, "$command -p $port_https -S -C 13960,14000" );
+	like( $result->output, '/CRITICAL - Certificate \'Monitoring Plugins\' expires in \d+ day\(s\) \(Fri Feb 16 15:31:44 2029 \+0000\)./', "output ok" );
+
+	$result = NPTest->testCmd( "$command -p $port_https_expired -S -C 7" );
+	is( $result->return_code, 2, "$command -p $port_https_expired -S -C 7" );
+	is( $result->output,
+		'CRITICAL - Certificate \'Monitoring Plugins\' expired on Wed Jan  2 11:00:26 2008 +0000.',
+		"output ok" );
+
+}
+
+my $cmd;
+
+# advanced checks with virtual hostname and virtual port
+SKIP: {
+	skip "libcurl version is smaller than $required_version", 6 unless $use_advanced_checks;
+	
+	# http without virtual port
+	$cmd = "./$plugin -H $virtual_host -I 127.0.0.1 -p $port_http -u /virtual_port -r ^$virtual_host:$port_http\$";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	# http with virtual port (!= 80)
+	$cmd = "./$plugin -H $virtual_host:$virtual_port -I 127.0.0.1 -p $port_http -u /virtual_port -r ^$virtual_host:$virtual_port\$";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+	
+	# http with virtual port (80)
+	$cmd = "./$plugin -H $virtual_host:80 -I 127.0.0.1 -p $port_http -u /virtual_port -r ^$virtual_host\$";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+}
+
+# and the same for SSL
+SKIP: {
+	skip "libcurl version is smaller than $required_version and/or HTTP::Daemon::SSL not installed", 6 if ! exists $servers->{https} or not $use_advanced_checks;
+	# https without virtual port
+	$cmd = "./$plugin -H $virtual_host -I 127.0.0.1 -p $port_https --ssl -u /virtual_port -r ^$virtual_host:$port_https\$";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	# https with virtual port (!= 443)
+	$cmd = "./$plugin -H $virtual_host:$virtual_port -I 127.0.0.1 -p $port_https --ssl -u /virtual_port -r ^$virtual_host:$virtual_port\$";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	# https with virtual port (443)
+	$cmd = "./$plugin -H $virtual_host:443 -I 127.0.0.1 -p $port_https --ssl -u /virtual_port -r ^$virtual_host\$";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+}
+
+
+sub run_common_tests {
+	my ($opts) = @_;
+	my $command = $opts->{command};
+	if ($opts->{ssl}) {
+		$command .= " --ssl";
+	}
+
+	$result = NPTest->testCmd( "$command -u /file/root" );
+	is( $result->return_code, 0, "/file/root");
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - 274 bytes in [\d\.]+ second/', "Output correct" );
+
+	$result = NPTest->testCmd( "$command -u /file/root -s Root" );
+	is( $result->return_code, 0, "/file/root search for string");
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - 274 bytes in [\d\.]+ second/', "Output correct" );
+
+	$result = NPTest->testCmd( "$command -u /file/root -s NonRoot" );
+	is( $result->return_code, 2, "Missing string check");
+	like( $result->output, qr%^HTTP CRITICAL: HTTP/1\.1 200 OK - string 'NonRoot' not found on 'https?://127\.0\.0\.1:\d+/file/root'%, "Shows search string and location");
+
+	$result = NPTest->testCmd( "$command -u /file/root -s NonRootWithOver30charsAndMoreFunThanAWetFish" );
+	is( $result->return_code, 2, "Missing string check");
+	like( $result->output, qr%HTTP CRITICAL: HTTP/1\.1 200 OK - string 'NonRootWithOver30charsAndM...' not found on 'https?://127\.0\.0\.1:\d+/file/root'%, "Shows search string and location");
+
+	$result = NPTest->testCmd( "$command -u /header_check -d foo" );
+	is( $result->return_code, 0, "header_check search for string");
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - 96 bytes in [\d\.]+ second/', "Output correct" );
+
+	$result = NPTest->testCmd( "$command -u /header_check -d bar" );
+	is( $result->return_code, 2, "Missing header string check");
+	like( $result->output, qr%^HTTP CRITICAL: HTTP/1\.1 200 OK - header 'bar' not found on 'https?://127\.0\.0\.1:\d+/header_check'%, "Shows search string and location");
+
+	my $cmd;
+	$cmd = "$command -u /slow";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, "$cmd");
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+	$result->output =~ /in ([\d\.]+) second/;
+	cmp_ok( $1, ">", 1, "Time is > 1 second" );
+
+	$cmd = "$command -u /statuscode/200";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /statuscode/200 -e 200";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - Status line output matched "200" - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /statuscode/201";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 201 Created - \d+ bytes in [\d\.]+ second /', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /statuscode/201 -e 201";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 201 Created - Status line output matched "201" - \d+ bytes in [\d\.]+ second /', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /statuscode/201 -e 200";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 2, $cmd);
+	like( $result->output, '/^HTTP CRITICAL - Invalid HTTP response received from host on port \d+: HTTP/1.1 201 Created/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /statuscode/200 -e 200,201,202";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - Status line output matched "200,201,202" - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /statuscode/201 -e 200,201,202";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 201 Created - Status line output matched "200,201,202" - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /statuscode/203 -e 200,201,202";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 2, $cmd);
+	like( $result->output, '/^HTTP CRITICAL - Invalid HTTP response received from host on port (\d+): HTTP/1.1 203 Non-Authoritative Information/', "Output correct: ".$result->output );
+
+	$cmd = "$command -j HEAD -u /method";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 HEAD - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -j POST -u /method";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 POST - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -j GET -u /method";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 GET - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /method";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 GET - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -P foo -u /method";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 POST - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -j DELETE -u /method";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 1, $cmd);
+	like( $result->output, '/^HTTP WARNING: HTTP/1.1 405 Method Not Allowed/', "Output correct: ".$result->output );
+
+	$cmd = "$command -j foo -u /method";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 2, $cmd);
+	like( $result->output, '/^HTTP CRITICAL: HTTP/1.1 501 Not Implemented/', "Output correct: ".$result->output );
+
+	$cmd = "$command -P stufftoinclude -u /postdata -s POST:stufftoinclude";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -j PUT -P stufftoinclude -u /postdata -s PUT:stufftoinclude";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	# To confirm that the free doesn't segfault
+	$cmd = "$command -P stufftoinclude -j PUT -u /postdata -s PUT:stufftoinclude";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /redirect";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 301 Moved Permanently - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -f follow -u /redirect";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -u /redirect -k 'follow: me'";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 301 Moved Permanently - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -f follow -u /redirect -k 'follow: me'";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -f sticky -u /redirect -k 'follow: me'";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+	$cmd = "$command -f stickyport -u /redirect -k 'follow: me'";
+	$result = NPTest->testCmd( $cmd );
+	is( $result->return_code, 0, $cmd);
+	like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
+  # These tests may block
+	print "ALRM\n";
+
+	# stickyport - on full urlS port is set back to 80 otherwise
+	$cmd = "$command -f stickyport -u /redir_external -t 5 -s redirected";
+	eval {
+		local $SIG{ALRM} = sub { die "alarm\n" };
+		alarm(2);
+		$result = NPTest->testCmd( $cmd );
+		alarm(0);	};
+	isnt( $@, "alarm\n", $cmd );
+	is( $result->return_code, 0, $cmd );
+
+	# Let's hope there won't be any web server on :80 returning "redirected"!
+	$cmd = "$command -f sticky -u /redir_external -t 5 -s redirected";
+	eval {
+		local $SIG{ALRM} = sub { die "alarm\n" };
+		alarm(2);
+		$result = NPTest->testCmd( $cmd );
+		alarm(0); };
+	isnt( $@, "alarm\n", $cmd );
+	isnt( $result->return_code, 0, $cmd );
+
+	# Test an external address - timeout
+	SKIP: {
+		skip "This doesn't seem to work all the time", 1 unless ($ENV{HTTP_EXTERNAL});
+		$cmd = "$command -f follow -u /redir_external -t 5";
+		eval {
+			$result = NPTest->testCmd( $cmd, 2 );
+		};
+		like( $@, "/timeout in command: $cmd/", $cmd );
+	}
+
+	$cmd = "$command -u /timeout -t 5";
+	eval {
+		$result = NPTest->testCmd( $cmd, 2 );
+	};
+	like( $@, "/timeout in command: $cmd/", $cmd );
+
+	$cmd = "$command -f follow -u /redir_timeout -t 2";
+	eval {
+		$result = NPTest->testCmd( $cmd, 5 );
+	};
+	is( $@, "", $cmd );
+
+}
diff --git a/plugins/tests/check_http.t b/plugins/tests/check_http.t
index bfecff2d..2f051fad 100755
--- a/plugins/tests/check_http.t
+++ b/plugins/tests/check_http.t
@@ -32,13 +32,16 @@ eval {
 	require HTTP::Response;
 };
 
+my $plugin = 'check_http';
+$plugin    = 'check_curl' if $0 =~ m/check_curl/mx;
+
 if ($@) {
 	plan skip_all => "Missing required module for test: $@";
 } else {
-	if (-x "./check_http") {
+	if (-x "./$plugin") {
 		plan tests => $common_tests * 2 + $ssl_only_tests + $virtual_port_tests;
 	} else {
-		plan skip_all => "No check_http compiled";
+		plan skip_all => "No $plugin compiled";
 	}
 }
 
@@ -187,7 +190,7 @@ if ($ARGV[0] && $ARGV[0] eq "-d") {
 }
 
 my $result;
-my $command = "./check_http -H 127.0.0.1";
+my $command = "./$plugin -H 127.0.0.1";
 
 run_common_tests( { command => "$command -p $port_http" } );
 SKIP: {
diff --git a/po/de.po b/po/de.po
index 72694e27..919fae32 100644
--- a/po/de.po
+++ b/po/de.po
@@ -13,10 +13,10 @@ msgstr ""
 "PO-Revision-Date: 2004-12-23 17:46+0100\n"
 "Last-Translator:  <>\n"
 "Language-Team: English <en@li.org>\n"
-"Language: en\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=iso-8859-1\n"
 "Content-Transfer-Encoding: 8bit\n"
+"Language: en\n"
 "Plural-Forms:  nplurals=2; plural=(n > 1);X-Generator: KBabel 1.3.1\n"
 
 #: plugins/check_by_ssh.c:86 plugins/check_cluster.c:76 plugins/check_dig.c:88
@@ -5438,8 +5438,8 @@ msgstr ""
 
 #: plugins/negate.c:174
 msgid ""
-"Ok must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer "
-"(0-3)."
+"Ok must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-"
+"3)."
 msgstr ""
 
 #: plugins/negate.c:180