caching images with apache reverse proxy

Question

I'm trying to set up an apache2 reverse proxy to cache images. (Apache, not nginx required)

There appear to be headers being cached, but not images,css etc.

My config:

CacheEnable disk / CacheDirLevels 5 CacheDirLength 3 Header unset Cache-Control CacheIgnoreNoLastMod On CacheIgnoreCacheControl On CacheMaxFileSize 100000000 CacheIgnoreNoLastMod On CacheMaxExpire 1209600 CacheIgnoreQueryString On ExpiresActive On ExpiresByType image/gif A600 ExpiresByType image/png A600 ExpiresByType image/jpeg A600 ExpiresByType text/css A600 ExpiresByType text/javascript A600 ExpiresByType application/x-javascript A600 ExpiresByType image/x-icon A600 

... find /var/cache/apache2/mod_disk_cache /var/cache/apache2/mod_disk_cache/yLp /var/cache/apache2/mod_disk_cache/yLp/RoH /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary/E8t /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary/E8t/g9u /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary/E8t/g9u/8de /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary/E8t/g9u/8de/VLu /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary/E8t/g9u/8de/VLu/3Io /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary/E8t/g9u/8de/VLu/3Io/qHld08w.data /var/cache/apache2/mod_disk_cache/yLp/RoH/iGt/8Dm/4KZ/uhEhPIw.header.vary/E8t/g9u/8de/VLu/3Io/qHld08w.header

find /var/cache/apache2/mod_disk_cache|grep jpeg & find /var/cache/apache2/mod_disk_cache|grep css result in nothing.

From error log (debug) [Sun Apr 28 14:22:36 2013] [debug] mod_cache.c(751): cache: Caching url: /~/media/Images/2011_01_LR_jpg.jpg [Sun Apr 28 14:22:36 2013] [debug] mod_cache.c(757): cache: Removing CACHE_REMOVE_URL filter.

Answer 1

I think mod_cache doesn't work out of the box, so you should tweak your apache httpd config or
vhost config: First on the Directory where the static files are located you would want to set:

 <FilesMatch "\\.(|pdf|jpg|jpeg|png|gif|)$"> Header unset Last-Modified </FilesMatch> 

Also in your cache_mod config as far as I remember you need to specify CacheRoot path:

 CacheRoot /path/to/your/cache_folder 

Hope this helps.