http2 - missing HTTP2_HEADER_FORWARDED

[ronag]

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Forwarded

[apapirovski]

Thanks for flagging this! Going through the list, there are a few of these missing. I'm not sure if the constants are meant to represent all official headers or a subset that's relevant to Node, or something else... I'll just cc @mcollina & @jasnell

[ssbrewster]

I've also picked up during tests that HTTP_STATUS_CONTENT_RESET should be HTTP_STATUS_RESET_CONTENT see #15323 I didn't see that this is already covered in #15153

[jasnell]

the constants were originally taken from the set already supported by Node.js' http1 implementation and that have backing RFC's. Mind opening a PR? :-)