We are using Squid as an adaptation proxy, with a farm of ICAP RESPMOD servers running on a single host. Our (partial) configuration is thus:
icap_enable on icap_service respmod_service1 respmod_precache 0 icap://<host>:<ip_1>/RESPMOD icap_service respmod_service2 respmod_precache 0 icap://<host>:<ip_2>/RESPMOD adaptation_service_set respmod_set respmod_service1 respmod_service2 adaptation_access respmod_set allow all We would like to add an additional service to our proxy, which our current RESPMOD server would route our requests to in specific cases. If I understand the configuration guide correctly (http://www.squid-cache.org/Doc/config/icap_service/), I need to make the following changes: * Modify the RESPMOD server to inject an "X-Next-Services: new_respmod_service<n>" header to activate the new service, and inject an "X-Next-Services: " header to deactivate the new service. * Modify the squid configuration thus: icap_enable on icap_service respmod_service1 respmod_precache 0 icap://<host>:<ip_1>/RESPMOD routing=1 icap_service respmod_service2 respmod_precache 0 icap://<host>:<ip_2>/RESPMOD routing=1 icap_service new_respmod_service1 respmod_precache 0 icap://<host>:<ip_3>/RESPMOD icap_service new_respmod_service2 respmod_precache 0 icap://<host>:<ip_4>/RESPMOD adaptation_service_set respmod_set respmod_service1 respmod_service2 adaptation_service_set new_respmod_set new_respmod_service1 new_respmod_service2 adaptation_access respmod_set allow all adaptation_access new_respmod_set allow all Can you tell us whether this configuration is correct, and clarify the following: * Does the RESPMOD server need to inject an "X-Next-Services: " header with no value to deactivate the new service, or will it be bypassed by default? * Each service has a farm of server processes for failover in case of error, but it seems the "X-Next-Services: new_respmod_server<n>" header will route to a specific service, not a service set. Is there a way to route requests to a service set or, if not, to provide failover for the new service? * We are using squid version 3.1.14, for which we cannot find the release notes (3.1.15 is the earliest version we found). Can you confirm that 3.1.14 supports service adaptation ? Francis Fauteux Software Engineer
