caching problem about cool-php-captcha

[GoogleCodeExporter]

I am a user of cool-php-captcha and i am aware of caching problem as well. But 
I don't understand how to apply your fix, can you please clearify it a bit?

Original comment by hsa2%[email protected] on 3 Feb 2011 at 7:14

[GoogleCodeExporter]

Simply adding headers to avoid cache. For example, you can put this at the 
beginning of the script:

header("Expires: Tue, 03 Jul 2001 06:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

Original comment by [email protected] on 7 Feb 2011 at 4:01

• Changed state: Accepted
• Added labels: Security

[GoogleCodeExporter]

It works with firefox but google chrome doesn't seem to care about expiration?

Original comment by hsa2%[email protected] on 8 Feb 2011 at 2:36

[GoogleCodeExporter]

Actually there is a bug report for chrome:
http://code.google.com/p/chromium/issues/detail?id=28035

Original comment by hsa2%[email protected] on 8 Feb 2011 at 2:47

[GoogleCodeExporter]

I think, the best for this would be, so you guys generate just different 
filenames, like:

/captcha_32112313.png, so it include the timestamp or smth like this.
then you won't need to bother about those expirations in different browsers, 
because it's insane!

and later make a rewrite rule, so it rewrites everything from captcha_*****.png 
to captcha.php

Good luck!

Original comment by [email protected] on 12 Oct 2011 at 7:26