[Varnish] #1228: Accessing req.backend.healthy in vcl_deliver with sick backend makes varnish crash

[Varnish]

#1228: Accessing req.backend.healthy in vcl_deliver with sick backend makes
varnish crash
----------------------+--------------------
 Reporter:  lkarsten  |       Owner:
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  build     |     Version:  3.0.3
 Severity:  normal    |  Resolution:
 Keywords:            |
----------------------+--------------------

Comment (by Poul-Henning Kamp <phk@…>):

 In [7db894f93330eed1da99336f69a3073a9629eeab]:
 {{{
 #!CommitTicketReference repository=""
 revision="7db894f93330eed1da99336f69a3073a9629eeab"
 Return false if req.backend.health is accessed in vcl_deliver{} where
 this information is no longer available.

 Fixes #1228
 }}}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1228#comment:1>
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