I'm no pro at squid-cache, but I do run a handful of reverse proxies doing things similar to what you want. You might want to consider using url_regex? Maybe something along the lines of this:
http_port 80 accel defaultsite=www.example1.com vhost cache_peer 10.0.0.3 parent 80 0 no-query originserver name=server3 cache_peer 10.0.0.1 parent 80 0 no-query originserver name=server1 cache_peer 10.0.0.2 parent 80 0 no-query originserver name=server2 acl site3 url_regex -I ^http://www.example1.com/?a=1&o=16188 ^http://www.example1.com/?a=1&o=16188 acl site1 url_regex -I ^http://www.example1.com acl site2 url_regex -I ^http://www.example2.com cache_peer_access server3 allow site3 cache_peer_access server1 allow site1 cache_peer_access server2 allow site2 cache_peer_access server3 deny all cache_peer_access server1 deny all cache_peer_access server2 deny all http_access allow site3 http_access allow site1 http_access allow site2 - Nick -----Original Message----- From: Oskar Stolc [mailto:oskar.st...@gmail.com] Sent: Sunday, June 26, 2011 5:41 AM To: squid-users@squid-cache.org Subject: [squid-users] Reverse Proxy - order of cache_peer_access rules Hi, I am trying to set up a Squid reverse proxy, but it does not want to work according my expectations. I am serving two sites: - www.example1.com - www.example2.com I have 3 backend servers: - 10.0.0.1 - 10.0.0.2 - 10.0.0.3 I want Squid to send the - www.example1.com queries to server 10.0.0.1 - www.example2.com queries to server 10.0.0.2 - if the query contains an o=16188 HTTP parameter I want Squid to send it to 10.0.0.3 regardless of domain Example: - http://www.example1.com/?a=1&b=2 - goes to 10.0.0.1 - http://www.example2.com/?a=1&b=2 - goes to 10.0.0.2 - http://www.example1.com/?a=1&o=16188 - goes to 10.0.0.3 - http://www.example2.com/?a=1&o=16188 - goes to 10.0.0.3 My configuration looks like this: acl site1 dstdomain www.example1.com acl site2 dstdomain www.example2.com acl ocode_param urlpath_regex o=16188 http_access allow site1 http_access allow site2 http_port 80 accel defaultsite=www.example1.com vhost cache_peer 10.0.0.1 parent 80 0 no-query originserver name=server1 cache_peer 10.0.0.2 parent 80 0 no-query originserver name=server2 cache_peer 10.0.0.3 parent 80 0 no-query originserver name=server3 cache_peer_access server3 allow ocode_param cache_peer_access server1 allow site1 cache_peer_access server2 allow site2 cache_peer_access server1 deny all cache_peer_access server2 deny all cache_peer_access server3 deny all The problem is that the queries with o=16188 don't go to 10.0.0.3, but are routed to 10.0.0.1 or 10.0.0.2 instead (based on domain). Does it mean the cache_peer_access rules are not "first match first win" rules? Should I re-order them? How? I've tried this on Squid 2.6 on CentOS5.6 and Squid 3.1 on Fedora15, both behave the same. Please help, any suggestions appreciated. Thanks, Oskar
