sessions and data expiring from cache

[genes]

Just when I thought my use of sessions was successful, I discovered that if a php script depends on a variable propagated to it via sessions I have trouble. If I do a 'View Frame Source' on the window, or do a 'Back', then a 'Forward' on my browser, I get this message instead of my source code or expected window content:

<TITLE>Missing Post reply data</TITLE>
<H1>Data Missing</H1>
This document resulted from a POST operation and has expired from the cache. If you wish you can repost the form data to recreate the document by pressing the <b>reload</b> button.

This means that my use of 'Back' is killed, and that is not good. This is avoided by propagating my variable via a hidden form input instead of declaring a 'session_start()' on that window. Unfortunately, this cannot always be done for a variety of reasons.

Does anyone have a solution to this problem.

Thanks for you help

[Anon]

Try this:

http://www.phpbuilder.com/forum/read.php3?num=2&id=122195&thread=122139

[luism]

I have exactly the opposite problem:
I need to prevent users from pressing back in the browser. User_id is passed along via a form with a hidden field. No, I cannot use sessions in php3.

Any advice would be appreciated.

thanks,