Proxies should not return hop-by-hop header fields

[bsvensson]

As per https://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-14#section-7.1.3 and https://www.mnot.net/blog/2011/07/11/what_proxies_must_do there are several "hop-by-hop header fields" that should not be parsed along by proxies, neither in requests nor responses.

• Connection
• Keep-Alive
• Proxy-Authenticate
• Proxy-Authorization
• TE
• Trailer
• Transfer-Encoding
• Upgrade

Some of the resource-proxies already do part of this. It would be good to test all of them...

[bsvensson]

(Testing out github's new "multiple assignes for an issue or PR)

[esoekianto]

This is interesting read, definitely something we need to add in the proxy to strip out these hop-by-hop headers

[bsvensson]

This should now be fixed for DotNet - see #433.

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