[Varnish] #116: Support purging by hostname

[Varnish]

#116: Support purging by hostname
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 Reporter:  gaute        |       Owner:  phk                
     Type:  enhancement  |      Status:  new                
 Priority:  normal       |   Milestone:                     
Component:  varnishd     |     Version:  trunk              
 Severity:  normal       |    Keywords:  purge host hostname
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 When serving many hosts through varnish it may sometimes be necessary to
 purge all pages from one host.
 There would be two ways to support this:

 1. make the hostname part of the data a regexp can match against when
 purging on the admin console.
 2. make purging by http/vcl able to take wildcards.

 The only way to do it now is to somehow get a list of all the cachable
 urls one host may contain, and purge them all by http.

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Ticket URL: <http://varnish.projects.linpro.no/ticket/116>
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