[Varnish] #374: Implement restart in vcl_error

[Varnish]

#374: Implement restart in vcl_error
----------------------+-----------------------------------------------------
 Reporter:  tcouery   |       Owner:  phk                
     Type:  defect    |      Status:  new                
 Priority:  normal    |   Milestone:  Varnish 2.1 release
Component:  varnishd  |     Version:  trunk              
 Severity:  normal    |    Keywords:  restart vcl_error  
----------------------+-----------------------------------------------------
 It would be very interesting to use restart in vcl_error to switch to a
 new backend when a server is down.
 We can't use restart in vcl_fetch when the server is down because
 vcl_fetch is never called.

 sub vcl_error {
   if (obj.status = 503) {
     restart;
   }
 }

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Ticket URL: <http://varnish.projects.linpro.no/ticket/374>
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