Hi, I am trying to set up Squid server as a common cache server for many Apache servers. Each Apache Web server is running as a front end for a J2EE application hosted on JBoss/Tomcat server. Depending on a URL pattern Apache is sending requests to either Squid or JBoss/Tomcat. If Squid cannot find requested resource in the cache it contacts the J2EE application on JBoss/Tomcat on port 8080 to load the resource (a BLOB, image, Flash file etc) from the database. In situations like this it is crucial that Squid contacts the JBoss server on the same host from which Apache sent the request for caching to Squid. Otherwise the user session in the J2EE application is invalidated. The problem is that Squid always tries to contact JBoss/Tomcat on the local host instead of the host that sent the caching request. Basically I am trying to tell squid to use the value of Host header to use when generating a request for the missing resources. So far I have not succeeded. Load balancer is forwarding user requests to Apache servers in round robin fashion. The application is accessed with the following URL : http://app_name.somedomain.com Apache/JBoss/Tomcat are on host1 Squid is on host 2. These are the settings in Apache httpsd.conf file that forward the caching requests to Squid on host1 ================================================================ ProxyPass /cache/pattern http://host2.somedomain.com:81/cache/pattern ProxyPassReverse /cache/pattern http://host2.somedomain.com:81/cache/pattern <ProxyMatch "/cache/pattern"> RequestHeader set Host host1.somedomain.com </ProxyMatch> These are Squid settings on host , say, host2 ========================================= http_port 81 http_port 3128 httpd_accel_host app_name.somedomain.com httpd_accel_port 8080 httpd_accel_single_host off httpd_accel_uses_host_header on httpd_accel_with_proxy on We are using Squid 2.5 stable Apache 2.0.x JBoss3.2.7/Tomcat 5.0 RedHat EL 3.0 many thanks, Dimitar
