This plugin is _no_ replacement of the default nagios check_http plugin.

It provides some functionality which the standard check_http doesn't have.

The standard check_http plugins does not allow to set warning or critical status depending on the page content. check_http can only return OK or Critical if a string (or regular expression) matches.

Using this plugin you can set multiple conditions for warning and/or critical status.

Combine regex and http codes:

./check_http.pl -H host.domain.com -u /test.html \
    -W '[Ww]arn' -W '[Mm]issing' -C '[Cc]rit' \
    -c 500 -c 404

Capital options (-W and -C) indicate regex patterns which should match the page content. The lowercase options are reserved for the HTTP Codes (regex can be used too).

There still many open tasks like user authentication support, configurable redirect support … Updates will follow.

-H
-u (default: /)
-p (default: 80)
-s, --ssl

      connection via ssl (default off)

-w

      state=warning, if the specified http code (404, 303, ...) is returned

-c

      state=critical, if the specified http code (404, 303, ...) is returned

-W

      if regex matches against page content -> state = warning

-C

      if regex matches against page content -> state = critical

-h, --help

      prints this help message

The -w, -c, -W and -C options can be specified multiple times.

If no -w, -c, -W or -C option is specified the following rules apply:

OK:             HTTP Response Code 2xx
WARNING:        HTTP Response Code 3xx
CRITICAL:       HTTP Response Code 4xx or 5xx

But without -w, -c, -W and -C option you better use the standard check_http plugin.

Link to plugin: