[Varnish] #1777: Range requests problem

[Varnish]

#1777: Range requests problem
-----------------------+----------------------
 Reporter:  llavaud    |       Type:  defect
   Status:  new        |   Priority:  normal
Milestone:             |  Component:  varnishd
  Version:  4.1.0-TP1  |   Severity:  normal
 Keywords:  range      |
-----------------------+----------------------
 Hello,

 I use Varnish 4.1.0-TP1 on debian wheezy.

 I have a strange problem with range requests, i request a page of the
 following size:

 {{{
 curl 'http://my_host/my_uri' --silent --write-out
 'size_download=%{size_download}\n' --output /dev/null
 size_download=32876
 }}}

 Now if i request the url with a range lower than the 32876 bytes (page
 size), example:


 {{{
 curl -i -H 'Range: bytes=0-32875' http://my_host/my_uri

 HTTP/1.1 206 Partial Content
 Date: Fri, 14 Aug 2015 12:14:37 GMT
 Set-Cookie:
 eZSESSIDac08b8c73ea29869f9b619cab686aebb=efcsqrs288hr30733qs18u29t4;
 expires=Sat, 15-Aug-2015 12:14:38 GMT; path=/
 Set-Cookie: e1_provider=europe1; path=/; domain=.europe1.fr
 Vary: Accept-Encoding
 X-Server: webdynphp54-06
 Content-Type: text/html; charset=UTF-8
 X-Varnish-Hostname: webcache24
 Age: 3
 X-S-Maxage: 60
 Cache-Control: max-age=120, public
 Accept-Ranges: bytes
 Content-Range: bytes 0-32875/*
 Content-Length: 32876
 Connection: keep-alive
 }}}


 curl end normaly and i got a 206 response from varnish, everything is ok

 Now if i request with a range set to 32876, varnish response seem ok:


 {{{
 curl -i -H 'Range: bytes=0-32875' http://my_host/my_uri

 HTTP/1.1 206 Partial Content
 Date: Fri, 14 Aug 2015 12:11:22 GMT
 Set-Cookie:
 eZSESSIDac08b8c73ea29869f9b619cab686aebb=kobb2cu9789ghsf1rqjpb7tcq7;
 expires=Sat, 15-Aug-2015 12:11:22 GMT; path=/
 Set-Cookie: e1_provider=europe1; path=/; domain=.europe1.fr
 Vary: Accept-Encoding
 X-Server: webdynphp54-06
 Content-Type: text/html; charset=UTF-8
 X-Varnish-Hostname: webcache24
 Age: 658
 X-S-Maxage: 60
 Cache-Control: max-age=120, public
 Accept-Ranges: bytes
 Content-Range: bytes 0-32876/*
 Content-Length: 32877
 Connection: keep-alive
 }}}


 but curl end with the following error:


 {{{
 curl: (18) transfer closed with 1 bytes remaining to read
 }}}

 This bug is problematic because most of crawler (Facebook, Google, ...)
 request page with a Range header and if the requested Range is greater
 than the page size, the crawler got a connection error.

 Thanks in advance for your help.

-- 
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1777>
Varnish <https://varnish-cache.org/>
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