Use forward headers for location lookup

[kpdecker]

Right now only the host header is used for inferencing the location parameter for relative redirects.

Rather than using only the host header, hapi should look at the various forwarded for, etc headers that proxies such as Akamai might set and use these first, failing over to the host header should those not be defined.

[hueniverse]

Where is the current code you are referring to?

[kpdecker]

https://github.com/spumko/hapi/blob/master/docs/Reference.md#server.config.location is the doced behavior.

https://github.com/spumko/hapi/blob/master/lib/response/headers.js#L44 is the hapi code

X-Forward-Host seems to be the most common header, but I've seen some others referencing X-Host but less formal documentation on that.
http://httpd.apache.org/docs/2.2/mod/mod_proxy.html#x-headers

[hueniverse]

What if there are multiple x-forward-host values listed (comma separated)? Use the previous or first?

[hueniverse]

Replaced by #1747

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