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Make HttpCache behaves more like a real reverse proxy#7034

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fabpot wants to merge 2 commits intosymfony:2.2from

fabpot:ip-cache

Commits on Feb 9, 2013

[HttpKernel] fixed the IP address in HttpCache when calling the backend
fabpot
committed

Commits on Feb 11, 2013

[HttpKernel] added support for the X-Forwarded-For header (closes #6982, closes #7000)
fabpot
committed