Mention unidirectional Stream Types 2 and 3 (QPACK) in -http

[Lekensteyn]

The Stream Types registry (https://tools.ietf.org/html/draft-ietf-quic-http-23#section-11.6) currently lists two types only (0 - control, 1 - push).

While working on a dissector for the base HTTP/3 protocol, I ran across 2 and 3. It turns out these are defined in the QPACK document (https://tools.ietf.org/html/draft-ietf-quic-qpack-10#section-8.2) with 2 - QPACK Encoder Stream, 3 - QPACK Decoder Stream.

Since QPACK has already been referenced multiple times from the -http document, what about mentioning (or registering) the two codepoints in the -http document and reference to the -qpack document for the definition?

[MikeBishop]

We can, and as QPACK is a required component of HTTP/3, you'd probably need to support QPACK for that to work. However, this is an extensible space and your dissector would need to tolerate other types it might not recognize, or that are added by future extensions. So the fact that there are definitions in other documents not mentioned by HTTP/3 is to be expected.