hi
try do search for anything for example "toy" , you will be directed to the search view results , try do "add to cart" or press the product name ,
for example if you press the product name link now you will see the product details page view , now try press on the back arrow button on the browser ,
you will get this error page :
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Webpage has expired

Most likely cause:
•The local copy of this webpage is out of date, and the website requires that you download it again.

What you can try:
Click on the Refresh button on the toolbar to reload the page. After refreshing, you might need to navigate to the specific webpage again, or re-enter information.

More information

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also the same problem happen if you do a search after you see the search results page press the back arrow of the browser , the browser will take you to the previous page but now if you press on the forward arrow of the browser you will not go to the search results instead you will get the same above error page.
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how the search cotroller can detect a a backward or forward arrow browser button is behind the request , and how we shall solve such issue ?
maybe i should enable caching i am not sure caching will solve this particular problem please advice ? and how to enable caching in codeigniter if so ?

i hope this solution will be stable ,
the problem was in the php.ini the session cach limiter was disabled there....
i changed it from nocache to private so it recognize private sessions and cach it......
session.cache_limiter = private

mr. myer is my solution right or wrong please advice ? i am not 100% understand how this solution worked , i just search for a solution for this error page and i found it in some forum by googling....

thanks.