Cache in htaccess

How to set headers in htaccess

[anjanesh]

To prevent caching via PHP

header("Cache-Control: no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0");

How do I get the same thing done via htaccess?

ExpiresByType image/jpg "modification plus 0 hours 0 minutes"

Whats the difference b/w mod_expires & mod_headers?

[jdMorgan]

In .htaccess:

Header set Cache-Control: "no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0"

You can enclose this in a <FilesMatch> container if you wish to control cache on a per-filetype basis. With cache header values such as these --which disable caching-- it would be a good idea to do so; Otherwise, even static objects like images on your site will be uncacheable, and your server bandwidth will probably skyrocket.

Using the "Expires" directive modifies the max-age parameter in the Cache-Control header sent by the server. However, due to module execution order it may or may not be possible for mod_expires to override the max-age in the "Header set" line above.

Jim