The easiest way to do this is use the check_http plug-in. This provides the response time from a specified Web site. For example,
host# check_http -I 192.168.0.1 -u /test_page.html -w 3 -c 4
The -I option specifies the IP address of the host running the web site to be tested, -u specifies the exact path you wish to check (defaults to /) and the -w and -c options specify the period in seconds which, if exceeded, will trigger the WARNING or CRITICAL status respectively.
You can see the other options available with this plug-in using the -h option. The check_http plug-in comes with the default plug-ins package.
This was first published in June 2006