"Tony Johansson" <johansson.andersson@telia.com> writes:
>How can I know when a certain page was last updated?
(Where is the connection to the world's most excellent
programming language?)
For special cases, it might help to retrieve copies of the
page as fast as possible (like every 10 ms), define
»update«, and then evaluate the retrieved pages according to
the definition. Then have the system write to a log (that
you can read) when an update was detected.
However, when a page is updated and then after 1 ms is
replaced by the previous state, the update might be undetected.
A web server might send different contents to visitors
depending on request details (like IP address, language,
browser). It is possible, that the contents send to some
visitors is updated, while the contents send to others is
not updated. So, there is no universal »page«.
When a serial number is embedded on every page served, the
page, technically said, is updated every time, but such an
update might not be relevant to you.