<div dir="ltr">I'm suspecting Apache's closing a keep-alive connection because it and Varnish didn't agree on the timeout. Can you check? (in varnish, the param is called backend_idle_timeout)</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>-- <br></div>Guillaume Quintard<br></div></div></div>
<br><div class="gmail_quote">On Wed, Mar 29, 2017 at 10:12 AM, Hazar Güney <span dir="ltr"><<a href="mailto:hazarguney@gmail.com" target="_blank">hazarguney@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr" style="font-size:12.8px">Backend is Apache.</div></div><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Wed, Mar 29, 2017 at 10:34 AM, Guillaume Quintard <span dir="ltr"><<a href="mailto:guillaume@varnish-software.com" target="_blank">guillaume@varnish-software.<wbr>com</a>></span> wrote:<br></span><div><div class="h5"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Indeed, looking at the Timestamp lines, it's not a timeout. What's your backend?</div><div class="gmail_extra"><br clear="all"><div><div class="m_-5876338162015177987m_-2409366051826912249gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>-- <br></div>Guillaume Quintard<br></div></div></div>
<br><div class="gmail_quote">On Wed, Mar 29, 2017 at 7:45 AM, Hazar Güney <span dir="ltr"><<a href="mailto:hazarguney@gmail.com" target="_blank">hazarguney@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><p style="margin:0px 0px 1em;padding:0px;border:0px;font-size:15px;clear:both;color:rgb(36,39,41);font-family:arial,"helvetica neue",helvetica,sans-serif">I see sporadic fetch errors (<span style="font-family:consolas,menlo,monaco,"lucida console","liberation mono","dejavu sans mono","bitstream vera sans mono","courier new",monospace,sans-serif;white-space:inherit;background-color:rgb(239,240,241);font-size:13px">http first read error: EOF)</span> from backend but backend is normally healthy. It seems that timeout is not the root issue in this case. What could be the reason?</p><pre style="white-space:pre-wrap;margin-top:0px;margin-bottom:1em;padding:5px;border:0px;font-size:13px;width:auto;max-height:600px;overflow:auto;font-family:consolas,menlo,monaco,"lucida console","liberation mono","dejavu sans mono","bitstream vera sans mono","courier new",monospace,sans-serif;background-color:rgb(239,240,241);word-wrap:normal;color:rgb(36,39,41)"><code style="margin:0px;padding:0px;border:0px;font-family:consolas,menlo,monaco,"lucida console","liberation mono","dejavu sans mono","bitstream vera sans mono","courier new",monospace,sans-serif;white-space:inherit">* << 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)<a href="http://microsoft.com/" target="_blank">microsoft.com</a>
- BereqHeader Host: XXXX
- BereqHeader User-Agent: Mozilla/5.0 (compatible; bingbot/2.0; +<a href="http://www.bing.com/bingbot.htm" target="_blank">http://www.bing.com/bingbot.h<wbr>tm</a>)
- 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
- <b>FetchError</b> <b>http first read error: EOF</b>
- 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 </code></pre></div>
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