Everything seems to be working fine but I'm getting the following msg on the settings page:
Missing Apache Modules
The following Apache modules are missing. The plugin will work without them but your visitors may see corrupted pages or out of date content.
mod_headers - Required to set caching information on supercache pages. IE7 users will see old pages without this module.
What modules are these and where do I get them? How and where do I install them?