fixed the IP address in HttpCache when calling the backend
added support for the X-Forwarded-For header (closes #6982, closes #7000)
merged branch fabpot/ip-cache (PR #7034)

This PR was submitted for the 2.2 branch but it was merged into the 2.1 branch instead (closes #7034).

Commits
-------

1fdded5 [HttpKernel] added support for the X-Forwarded-For header (closes #6982, closes #7000)
be65d7c [HttpKernel] fixed the IP address in HttpCache when calling the backend

Discussion
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Make HttpCache behaves more like a real reverse proxy

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6982, #7000
| License       | MIT
| Doc PR        | n/a

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by bendavies at 2013-02-10T00:55:29Z

Awesome, thanks Fabien. should this not target 2.0/2.1?