On Wed, Sep 12, 2012 at 1:15 PM, Bhattacharya, Sudip <sudip.bhattacha...@genpact.com> wrote: > I am using mod_cache module to enable caching of certain subfolders in > VirtualHost section which is mapped to proxy requests to a remote server. > > Is there any way to log requests specific to cached files? I want to know: > 1. Which files are actually getting cached > 2. How many requests are actually getting served from local cache. > Effectively how much bandwidth I am saving by serving files from local cache. > 3. Is it possible to avoid the default folder structure of the caching, and > get a mirror structure instead of the remote path/folder/file structure > instead? > 4. Is it possible to enable caching for specific file extensions, or by MIME > type >
In 2.2 you can alter the access log to output the handler that handled the request (the format for this is %R) - when an item is returned from the cache the handler will be empty. In 2.4 you can add set "CacheHeader on", and each response will have a "X-Cache" header added to it that says whether it was a hit or not, which can then be logged. You cannot alter the cache file structure in that manner. However, if you can synchronise all these files from the backend to the cache, you could then only proxy to the backend if the file is not present on the frontend. This would require manual synchronisation of files on both sides. Whether a resource is stored in the cache or not depends upon the headers that the response has. See the section labelled "What Can be Cached" here: http://httpd.apache.org/docs/2.2/caching.html If you don't want a particular resource to be cached, or vice-versa, set appropriate response headers. "Cache-Control: private" would allow the client receiving the resource to cache it, but not your apache cache, nor any intermediate cache between there and the client. Cheers Tom --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org For additional commands, e-mail: users-h...@httpd.apache.org
