On Tue, May 2, 2006 7:06 pm, Davi Arnaut said: > There is not such scenario. I will simulate a request using the disk_cache > format:
The way HTTP caching works is a lot more complex than in your example, you haven't taken into account conditional HTTP requests. A typical conditional scenario goes like this: - Browser asks for URL from httpd. - Mod_cache has a cached copy by looking up the headers BUT - it's stale. mod_cache converts the browser's original request to a conditional request by adding the header If-None-Match. - The backend server answers "no worries, what you have is still fresh" by sending a "304 Not Modified". - mod_cache takes the headers from the 304, and replaces the headers on the cached entry, in the process making the entry "fresh" again. - mod_cache hands the cached data back to the browser. Read http://www.ietf.org/rfc/rfc2616.txt section 13 (mainly) to see in detail how this works. Regards, Graham --
