I just Installed WP Super Cache and the WP Super Cache Manager writes:
Missing Apache Modules
The following Apache modules are missing. The plugin will work in half-on mode without them. In full Supercache mode, your visitors may see corrupted pages or out of date content however.
mod_expires - Set the expiry date on supercached pages. Visitors may not see new pages when they refresh or leave comments without this module.
I just don't have z clue where I can set these expiry date, in .htaccess ???
Anyone who can help?