[Varnish] #1650: X-Forwarded-For looses the first ip in list

[Varnish]

#1650: X-Forwarded-For looses the first ip in list
--------------------------+-----------------------
 Reporter:  KlavsKlavsen  |       Owner:
     Type:  defect        |      Status:  needinfo
 Priority:  normal        |   Milestone:
Component:  build         |     Version:  4.0.2
 Severity:  normal        |  Resolution:
 Keywords:                |
--------------------------+-----------------------

Comment (by KlavsKlavsen):

 Finally got to debug it, and found the reason.

 The cisco ACE box in front, adds a new x-forwarded-header - even though
 there already is one :(

 So varnish receives this:
 -   ReqHeader      X-Forwarded-For: 10.230.103.96
 -   ReqHeader      X-Forwarded-For: 77.66.12.106, 10.230.1.34

 which then gets sanitized to:
 -   ReqHeader      X-Forwarded-For: 10.233.113.96, $ip-of-client-
 contacting-varnish

 whereas on our current setup, we simply return in varnish 3 - so it does
 not touch the x-forwarded-for headers - and appearently php (the website
 behind this - not something I work on :) magicly converts these two x
 -forwarded-headers into one list.

-- 
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1650#comment:5>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator