I've just rolled back a failed Squid migration from 2.6 to 3.0, and I'm looking for reasons why it failed. I have been successfully using the latest Squid 2.6 to http-accel a pool of backend web servers, with a load-balancer in front to direct traffic. The load-balancer hits the squid server with a health check, i.e. GET /mgmt/alive and expects an HTTP 200, before allowing it to have traffic. When I turned up Squid3, all health checks failed...showing the following in access.log: 1226355682.853 0 <ip_of_load-balancer> NONE/400 1931 GET http://cached.whatever.com/ps/management/alive - NONE/- text/html 1226355684.875 0 <ip_of_load-balancer> NONE/400 1931 GET http://cached.whatever.com/ps/management/alive - NONE/- text/html 1226355687.905 0 <ip_of_load-balancer> NONE/400 1931 GET http://cached.whatever.com/ps/management/alive - NONE/- text/html After some troubleshooting and turning debug_options up, it appears that perhaps it's the request done without a hostname that's the problem, because I see 'parseHttpRequest: Missing HTTP identifier' in cache.log with debug_options set to ALL,3. Squid 2.6 handled these fine, and my configuration hasnt changed, so was there something introduced in Squid3 that demands a hostname? I know from packet captures that my load-balancer literally connects to the squid server on port 80 and does a GET /mgmt/alive (not GET http://cached.whatever.com/mgmt/alive) Here are the relevant portions of my config: http_port 80 accel defaultsite=cached.whatever.com vhost cache_dir null /tmp cache_peer 1.1.1.1 parent 80 0 no-query no-digest originserver name=Cached-Whatever cache_peer_domain Cached-Whatever cached.whatever.com acl our_site dstdomain cached.whatever.com acl Origin-Whatever dst 1.1.1.1 acl acceleratedPort port 80 acl HealthChecks urlpath_regex mgmt/alive always_direct allow HealthChecks cache deny HealthChecks cache allow Origin-Whatever http_access allow Origin-Whatever acceleratedPort http_access deny all http_reply_access allow all access_log /var/log/squid/access.log squid !HealthChecks visible_hostname cached.whatever.com unique_hostname squid03 Thanks - Gregori
