[quicwg/base-drafts] HTTP/3 references QUIC Stream IDs directly, allowing illegal references (#3273)

[ianswett <[e-mail]>]

Currently, HTTP/3 references QUIC Stream IDs directly in the case of requests.  However, requests are only 1 of the 4 stream types, so 3/4 of the values in GOAWAY are currently invalid, though we don't specify what happens if you receive one of those invalid values in the current draft(or I missed it).

QUIC transport has moved to a design for MAX_STREAMS(https://tools.ietf.org/html/draft-ietf-quic-transport-24#section-19.11) that specifies the allowed number of streams of a given type, rather than the Stream ID.

Currently, this is a very minor point, since it's only the GOAWAY frame that references Stream ID, but future frames, such as the PRIORITY_UPDATE frame from the HTTP priorities draft will also want to reference the Stream ID, as will future extension frames I expect.

So I suggest we call this a Request ID and it's the Stream ID of a client bidi stream right shifted 2 bits or however else we'd like to describe it.

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