sessions and POST method !!!

Anon

whenever I use post method on a script that uses sessions and I press BACK button on my browser i get THIS PAGE HAS EXPIRED error .. can anybody please tell me how to avoid this problem ???

10x

Armando

Anon

This is a message from your browser and has nothing to do with PHP or Sessions.
I simply means that the page you want to look at is not stored in the browser cache anymore. This can have various reasons, the most common are that your cache is disabled or too small.

Anon

We had the same problem. Here's the code we used to get around it. It detects a POST and then send headers to allow the client to cache the result which override the ones sent by start_session().

// Here we check to see if it was a "POST"
// form submit and allow caching so the
// back button won't give page expired
// These headers must be sent after the
// start_session() call on the page

if ($REQUEST_METHOD=='POST')
{
header('Expires: ' . gmdate("D, d M Y H:i:s", time()+1000) . ' GMT');
header('Cache-Control: Private');
}

-Kevin

Anon

Does this actually work for you? I've tried just about every combination of headers and none of them will allow Netscape to use the back button in conjunction with session variables. If this is working for you I'd love to hear what else you might have going on that seperates my non-working code from your working code. Thanks.

Jamie

Anon

The main thing is that you insert these headers AFTER you do your sessioning... So after you call any session functions. Since the session functions sends headers to the borwser you need to overwrite headers to make it cacheable.

-Kevin

Anon

hi all,
for older versions of netscape try:

if ($REQUEST_METHOD=='POST')
{
header('Expires: ' . gmdate("D, d M Y H:i:s", time()+1000) . ' GMT');
header('Cache-Control: Private');
header ("Pragma: Private"); // HTTP/1.0
}

for me works.
bye