[Varnish] #1489: Assert error to use the req.esi in vcl_backend_response

[Varnish]

#1489: Assert error to use the req.esi in vcl_backend_response
----------------------+-----------------------------------------------
 Reporter:  xcir      |       Owner:  Martin Blix Grydeland <martin@…>
     Type:  defect    |      Status:  closed
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  4.0.0
 Severity:  normal    |  Resolution:  fixed
 Keywords:            |
----------------------+-----------------------------------------------
Changes (by Martin Blix Grydeland <martin@…>):

 * status:  new => closed
 * owner:   => Martin Blix Grydeland <martin@…>
 * resolution:   => fixed


Comment:

 In [9aa6eef5b2f37f2197ff70bb41e74705b83f80eb]:
 {{{
 #!CommitTicketReference repository=""
 revision="9aa6eef5b2f37f2197ff70bb41e74705b83f80eb"
 Fix up req.esi to only be available in client context.

 Fixes: #1489
 Spotted by: xcir
 }}}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1489#comment:1>
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