I've been working on using Squid as an image cache for images that really won't change very often but do have dynamic-looking addresses (large querystrings). I've been able to get Squid to cache these images in memory, so if I do a fresh pageload from Opera or Safari, I get a TCP_MEM_HIT, which is fantastic, but when I reload the page, I get a TCP_REFRESH_MISS, which is not so great. I know that the browser is specifying that this is a reload so it'll get the cache to re-cache the image, but I really don't want this to happen - actually hitting the images is a very expensive operation, since they're generated. How can I get squid to ignore browser refreshes and just serve everything as if it was a new request? Ideally images will live in the cache almost forever and always be served from the cache. My squid.conf is below. Thanks! Tom MacWright http_port 80 accel defaultsite=209.20.72.110 cache_peer 127.0.0.1 parent 8080 0 no-query originserver name=myAccel acl mapbox_sites dstdomain 209.20.72.110 http_access allow mapbox_sites cache_peer_access myAccel allow mapbox_sites # Items without a specific expiry date will be fresh for 10 minutes # After 20% of the object's stated life (via Expires) the object will be refreshed # the longest non-specified objects can last is 4320 minutes # refresh_pattern -i (/cgi-bin/|\?) 10 100% 4320 refresh_pattern . 300 20% 4320 # by default, squid ignores requests which have a ? in them # so, we override this (and comment out the code later on in this doc) # this also commands squid to ignore lots of things that would prevent # it from caching stuff with certain headers refresh_pattern -i \? 3000 990% 30000 override-expire override-lastmod ignore-no-cache ignore-private ignore-reload cache_dir ufs /var/spool/squid 500 16 256 # Cache commonly-used images in memory, since that's nice. maximum_object_size_in_memory 1000 KB maximum_object_size 1 GB
