[Varnish] #611: Websockets support

[Varnish]

#611: Websockets support
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 Reporter:  wesnoth      |        Owner:  phk    
     Type:  enhancement  |       Status:  closed 
 Priority:  normal       |    Milestone:         
Component:  varnishd     |      Version:  trunk  
 Severity:  normal       |   Resolution:  invalid
 Keywords:               |  
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Comment(by leedo):

 I can confirm that varnish seems to be stripping the Upgrade header, even
 when pipe is being used. The WebSocket parser I am using attempts to
 validate the request with this header.

 One also has to be sure to comment out `set bereq.http.connection =
 "close";` which was in the default debian vcl_pipe function.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/611#comment:7>
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