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[quicwg/base-drafts] Guidance for propogation of errors between H2 and H3 (#2817)

Lucas Pardue <notifications@github.com> Wed, 19 June 2019 16:21 UTC

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From: Lucas Pardue <notifications@github.com>
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Subject: [quicwg/base-drafts] Guidance for propogation of errors between H2 and H3 (#2817)
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An intermediary that converts between HTTP/2 and HTTP/3 is likely to end up needing to propagate errors between the protocols. We don't have much guidance for this.

Some points from the mailing list discussion on this:

* Suspect an intermediary that receives error codes from the upstream would convert many of these to 502 errors
* The REJECTED error code is a possible exception to the above behaviour
* It may be preferable to propagate "temporary" errors (REFUSED_STREAM) and CONNECT_ERROR (the use case related to websocket usage, although there is no formal HTTP/3 websockets yet).

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