[Webtransport] Http3Transport pooling/sharing

Bernard Aboba <bernard.aboba@gmail.com> Mon, 09 November 2020 18:32 UTC

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From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Mon, 09 Nov 2020 10:32:38 -0800
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To: WebTransport <webtransport@ietf.org>
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Subject: [Webtransport] Http3Transport pooling/sharing
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One of the use cases that has been described in the recent W3C WebTransport
WG meeting was sharing of an HTTP/3 QUIC connection between HTTP/3
Request/Response and WebTransport.

In looking into how this would work in practice, it appears that there are
some complications.

Http3Transport requires support for HTTP/3 Datagrams.
draft-vvv-webtransport-http3
Section 4.1 says:

"If "http3_transport_support" is negotiated, support for the QUIC DATAGRAM
extension MUST be negotiated."
What happens if there is an existing HTTP/3 connection to the same Origin
but that connection did not negotiate support for QUIC DATAGRAMS?