[Varnish] #448: Allow caching with past-date Expires (without cache-control)

[Varnish]

#448: Allow caching with past-date Expires (without cache-control)
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 Reporter:  stonor    |        Owner:  tfheen    
     Type:  defect    |       Status:  closed    
 Priority:  normal    |    Milestone:            
Component:  varnishd  |      Version:  trunk     
 Severity:  normal    |   Resolution:  worksforme
 Keywords:            |  
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Changes (by phk):

  * status:  new => closed
  * resolution:  => worksforme

Comment:

 The reason we have both obj.cacheable and obj.ttl is that they control
 separate decisions.

 For instance, setting obj.ttl = 0s does not prevent the object from being
 cached for use in grace-schenarios.

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Ticket URL: <http://varnish.projects.linpro.no/ticket/448#comment:4>
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