[Varnish] #1392: no logging when saintmode denies a backend connection

[Varnish]

#1392: no logging when saintmode denies a backend connection
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 Reporter:  odoucet  |       Type:  enhancement
   Status:  new      |   Priority:  normal
Milestone:           |  Component:  varnishd
  Version:  unknown  |   Severity:  normal
 Keywords:           |
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 Following this discussion on varnish mailing list :
 https://www.varnish-cache.org/lists/pipermail/varnish-
 misc/2013-July/023205.html

 When saintmode denies a backend connection, we only get a 503 error in log
 with FetchError 'no backend connection'.
 It should be very useful to know why, and explicit that saintmode did
 something.
 Per Buer said he has a patch for this already.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1392>
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