:authority is not required by spec

[fredr]

If I understand the spec RFC 7540, :authority is not required

All HTTP/2 requests MUST include exactly one valid value for the
   ":method", ":scheme", and ":path" pseudo-header fields, unless it is
   a CONNECT request (Section 8.3).  An HTTP request that omits
   mandatory pseudo-header fields is malformed (Section 8.1.2.6).

[essen]

Yes it seems to not be mandatory when a proxy translates an HTTP/1.1 request and it was using origin or asterisk form. I had not noticed that. This will need a test in rfc7540_SUITE in Cowboy though.

[essen]

Merged, thanks!

[fredr]

🍻

[essen]

I think I was too quick to merge this. The host header check makes better sense in this module than in Cowboy. I don't think this module should return pseudo headers without an authority. I will fix it.

[fredr]

Cool!

Let me know if you want me to do anything. I guess we can close ninenines/cowboy#1349 then?

[essen]

Some parts of it are useful. I'm on it, I'll close it soon once I'm done.

[essen]

OK after a lot of thinking I think I will leave the changes as they are currently. I don't like mixing up pseudo headers and regular headers from a semantic point of view. I will just tweak the other PR and merge.