I see sporadic fetch errors (http first read error: EOF) from backend but backend is normally healthy. It seems that timeout is not the root issue in this case. What could be the reason?
* << BeReq >> 98808229 - Begin bereq 98808228 fetch - Timestamp Start: 1490683823.763272 0.000000 0.000000 - BereqMethod GET - BereqURL XXXX - BereqProtocol HTTP/1.1 - BereqHeader Pragma: no-cache - BereqHeader Accept: */* - BereqHeader From: bingbot(at)microsoft.com - BereqHeader Host: XXXX - BereqHeader User-Agent: Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) - BereqHeader Accept-Encoding: gzip - BereqHeader X-Varnish: 98808229 - VCL_call BACKEND_FETCH - VCL_return fetch - BackendOpen 38 reload_2017-03-20T11:32:44.st2 10.35.78.11 80 172.17.0.2 48388 - BackendStart 10.35.78.11 80 - Timestamp Bereq: 1490683823.763758 0.000487 0.000487 - *FetchError* *http first read error: EOF* - BackendClose 38 reload_2017-03-20T11:32:44.st2 - Timestamp Beresp: 1490683823.764271 0.000999 0.000513 - Timestamp Error: 1490683823.764277 0.001005 0.000005 - BerespProtocol HTTP/1.1 - BerespStatus 503 - BerespReason Service Unavailable - BerespReason Backend fetch failed - BerespHeader Date: Tue, 28 Mar 2017 06:50:23 GMT - BerespHeader Server: Varnish - VCL_call BACKEND_ERROR - BereqHeader X-Varnish-Backend-5xx: 1 - VCL_return retry - Timestamp Retry: 1490683823.764294 0.001022 0.000017 - Link bereq 97940444 retry - End
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