275447 - Form fields cleared when Back button pressed when using PHP session_start();

Status: RESOLVED DUPLICATE of bug 268037

(SeaMonkey :: General, defect)

Description

[Jason K Carter]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.5) Gecko/20041217
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.5) Gecko/20041217

Returning to an HTML form that uses PHP sessions (which pass the cookie
PHPSESSID) by using the Back button causes the form data to reset.

Reproducible: Always

Steps to Reproduce:
1. Go to http://maizecoop.cropsci.uiuc.edu/bugzilla4/index2.php
2. Type a search.
3. Press return.
4. Click the back button on your browser.
Actual Results:  
The form field is now blank.

Expected Results:  
The form fields contain the original data.

This issue affects Mozilla 1.7.5 and Firebird 1.0.

This issue does not affect Mozilla 1.7.3 or Firebird 1.0PR.

This bug is similar to 268037.  However, I have not altered the Cache-Control
header at all.  This is a separate issue.

Comment 1

[Christian :Biesinger (don't email me, ping me on IRC)]

no matter what you think you do, you do have Cache-Control: no-store set:
 4 Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0

hence, marking duplicate.

*** This bug has been marked as a duplicate of 268037 ***

Comment 2

[Jason K Carter]

Alright, I see the problem now.  Apparently, the default behavior of PHP's
session_start() function is to send implicit Cache-Control headers.  To override
this behavior, use session_cache_limiter() to enable client caching.  A full
explanation can be seen at:

<a
href='http://us2.php.net/manual/en/function.session-cache-limiter.php'>http://us2.php.net/manual/en/function.session-cache-limiter.php</a>