HTTP Express is a HTTP proxy that catches all images, css, javascript and flash movies on the fly to add correct HTTP headers. It adds the following headers:
- Expires
- Cache-control
- Pragma
- Last-modified
All files under your wordpress installation will be automatically processed to be served with the correct HTTP headers.
HTTP Express need Apache with mod_rewrite
Upload the HTTP Express plugin to your blog, Activate it. Remember that if your .htaccess file has no writing permission you should add some code lines manually (check the admin page of the plugin for details)