Test and Support HTTP/2.0

[bsvensson]

Very basic testing with HTTP/2.0 server seems to work.  However, there's a number of things that basic investigation highlighted or needs more investigation. Here's some initial notes:

When proxy hosted on HTTP/2.0:

• HTTP/2 does away with the ‘reason phrase’. In HTTP/1.1 it was possible for servers to submit a human readable reason along with the status code, such as HTTP/1.1 404 Can't find it anywhere!. Or HTTP/1.1 200 I like pebbles, but in HTTP/2 this is removed.  The proxies return these "reason phrases".

When HTTP/1.1 hosted proxy connects to  HTTP/2.0 server:

• HTTP/2.0 use lower-case headers (and with less white-space). HTTP/1.1 headers are supposed to be case-insensitive.

Ref:
https://http2.github.io/http2-spec/
https://evertpot.com/http-2-finalized/

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