Created attachment 22996 [details]
caches any request that has an expires or cache control header

RFC2616 section 13.4 states that certain response status codes should not be cached, unless they contain a valid Expires or Cache Control header. mod_cache does not handle this correctly, keeping some requests from being cached.

For example, http://en-us.fxfeeds.mozilla.com/en-US/firefox/headlines.xml, returns the headers:

HTTP/1.1 302 Found
Expires: Fri, 05 Dec 2009 08:25:05 GMT
Content-Length: 323
Date: Fri, 05 Dec 2008 08:25:06 GMT
Location: http://fxfeeds.mozilla.com/firefox/headlines.xml
Server: Apache/2.2.3 (Red Hat)
Content-Type: text/html; charset=iso-8859-1
Keep-Alive: timeout=20, max=930
X-Cache-Info: cached
Connection: Keep-Alive

While a 302 would normally not be cached, since this request has an Expires header it should be. This patch adds logic to cache any response status code, if it has an Expires or Cache Control header.