Re: Random “http first read error: EOF” errors

[Guillaume Quintard]

Indeed, looking at the Timestamp lines, it's not a timeout. What's your
backend?

-- 
Guillaume Quintard

On Wed, Mar 29, 2017 at 7:45 AM, Hazar Güney <hazarguney at gmail.com> wrote:

> 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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