[Varnish] #215: regex matches sporadically on identical request

[Varnish]

#215: regex matches sporadically on identical request
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 Reporter:  onitunes  |        Owner:  des  
     Type:  defect    |       Status:  new  
 Priority:  normal    |    Milestone:       
Component:  build     |      Version:  1.0.4
 Severity:  normal    |   Resolution:       
 Keywords:            |  
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Comment (by onitunes):

 Of course, the regex could be matching correctly at all times and the `set
 req.backend = old_production` could be failing to register.

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Ticket URL: <http://varnish.projects.linpro.no/ticket/215#comment:1>
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