Translate Host -> :authority

[pranaygp]

curl does this thing where, when you use http2, it'll translate the Host header to the :authority pseudo-header.

Is that something fetch-h2 should be doing too before making a request?

[matheuss]

I was investigating this earlier and tried to set my own :authority, but it's not allowed 🤔 I suppose it's a bug since the spec allows it?

[grantila]

Yeah, the spec doesn't allow any pseudo-headers.

A field name MUST be composed of printable US-ASCII characters (i.e., characters that have values between 33 and 126, inclusive), except colon.

This is probably why they chose to use colon for psuedo-headers, simply because they aren't legal real headers.

Converting Host to :authority does seem reasonable. @pranaygp did curl convert it or copy it to :authority, i.e. did it remove host as header, or have both of them?

[pranaygp]

It's definitely replacing it @grantila
based on this fragment in curl

https://github.com/curl/curl/blob/544bfdebea2a9e8be1c01fc7954cd49638fe2803/lib/http2.c#L1888-L1896

[grantila]

Great digging, Sherlock.

[grantila]

Released in 0.0.12