[Varnish] #1672: Assert on cached object with non-200 status and bogus 304 backend reply

[Varnish]

#1672: Assert on cached object with non-200 status and bogus 304 backend reply
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 Reporter:  martin  |      Owner:
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  build   |    Version:  unknown
 Severity:  normal  |   Keywords:
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 If the backend replies 304 Not Modified even though Varnish didn't send
 any INM/IMF headers and the "ims_oc" is an object with non-200 status,
 Varnish asserts.

 See attached test case and patch.

 Martin

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1672>
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