Re: [squid-users] Serving the cache on browser refreshes?

Tom MacWright wrote:
> 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
> acl mapbox_sites dstdomain 209.20.72.110

hmm, your website domain name is "209.20.72.110". Thats not very good.

> cache_peer 127.0.0.1 parent 8080 0 no-query originserver name=myAccel
>
> 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

gaaaahhh!!
# refresh_pattern -i (/cgi-bin/|\?) 0 0% 0

> 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
>

Will never happen, the '.' pattern is matched first/above.
Move this to the top of the refresh_patterns list. And check that the
pattern does not match anything unwanted.

> 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

Amos

-- 
Please be using
   Current Stable Squid 2.7.STABLE6 or 3.0.STABLE13
   Current Beta Squid 3.1.0.5