Avoid "Page Has Expired" Warnings

This problem occurs in my office's ticketing web application (using php). When switching back to previous page using back button of the browser, it displays a warning that page has expired. To obtain it, we have to press F5 in IE. In firefox always shows cofirmation box to resend the page.

Googling for the solutions, i found two references that useful:
http://support.microsoft.com/kb/183763
http://shiflett.org/articles/how-to-avoid-page-has-expired-warnings

I then change the php.ini configuration from:


session.cache_limiter = nocache

to:

session.cache_limiter = private

note:

lately known that this "private" option causes new problem, when clicking home the applications always prompt login form. well this is annoying.

I then set:

session.cache_limiter =

refs:
http://php.net/manual/en/function.session-cache-limiter.php
php.ini comments