https://bugzilla.wikimedia.org/show_bug.cgi?id=52776
--- Comment #3 from Antoine "hashar" Musso <[email protected]> --- 503 means the backend service is not reachable. I made a few connections tests and they never reach the Apaches backends so there must be something weird happening at Varnish level (deployment-cache-text1 instance). I did some simple refreshes in my browser against a random page ( http://en.wikipedia.beta.wmflabs.org/wiki/Dido_Sotiriou ) that gave me the 503 timeout when using a browser though I had no issue getting the page served via curl (which sends no header). Using curl I get the page served by varnish text frontend. X-Cache from three requests: X-Cache: deployment-cache-text1 hit (4), deployment-cache-text1 frontend hit (39) X-Cache: deployment-cache-text1 hit (4), deployment-cache-text1 frontend hit (40) X-Cache: deployment-cache-text1 hit (4), deployment-cache-text1 frontend hit (41) Using a browser I get: X-Cache:deployment-cache-text1 miss (0), deployment-cache-text1 frontend miss (0) Some header(s) being send by the browser cause the request to not be cacheable. That in turns overload the Apache backends which takes a long time to server the request which might lead varnish to serve a 503 whenever the timeout as been reached. -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. _______________________________________________ Wikibugs-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikibugs-l
