wich request would you like to cache ? this ? http://our.domain.net:8888/webservices/imaging//view/2/5505/450/338/6885ede829b44e8e7b3eadf5f152a00efb95cbff or this ? http://our.domain.net/ourdom/assets/lightbox/images/blank.gif If it is the first, then you can go two paths. either provide specific expiration in the http headers (i.e. cache-control: max-age=600, Expires : Tue, 10 Oct 2006 16:58:56 GMT) or modify the "refresh_pattern" directive in squid.conf to allow more cache time for your requests. Hope this helps.