If your server send Last-Modified headers then Squid will use this and issues a If-Modified-Since request to validate the freshness of the cached copy when refresh_pattern says the file is stale..
While refresh_pattern says that the file is fresh it is given directly from the cache without validating the freshness with the backend server. Regards Henrik On Tuesday 04 March 2003 20.39, Craig Kelley wrote: > Hello everyone; > > We have squid running in a transparent mode (httpd_accel) to > another server so that we can reduce the load over an expensive > link. Everything works great, but it seems that squid is not > checking the `last modified' http headers from the source server > (?) Is there a way to have squid check the http header from the > remote machine to determine whether or not a file needs to be > re-fetched, or does it simply go `stale' in the squid cache and > require re-fetching the whole file again? > > We're currently using these directives: > > httpd_accel_host 63.227.133.121 > httpd_accel_port 80 > httpd_accel_single_host on > httpd_accel_with_proxy off > httpd_accel_uses_host_header on > > Thanks, > > Craig Kelley
