Httping is like 'ping' but for http-requests.
Give it an url, and it'll show you how long it takes to connect, send a request and retrieve the reply (only the headers). Be aware that the transmission across the network also takes time! So it measures the latency of the webserver + network.
It supports, of course, IPv6.
HTTPing should run fine on all Posix compliant systems (verified on Linux, *BSD, Solaris, IRIX and AIX).
2.3.3 compilation fixes (for MacOS X)
2.3 more detailed statistics, can now configure all kinds of network settings, can now be localized, improvements of error messages and on-line help, improvements of GUI mode. see this page for a more complete list of changes
2.2.1 mostly a bugfix release (segfaults, FreeBSD build fixes)
Using httping from Nagios
Nagios is a versatile monitoring package. Very much flexible.