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[quicwg/base-drafts] Transport error codes would be smaller and more consistent as a varint (#2672)

ianswett <notifications@github.com> Tue, 07 May 2019 20:24 UTC

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Subject: [quicwg/base-drafts] Transport error codes would be smaller and more consistent as a varint (#2672)
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Currently there are three spots in the QUIC transport spec which used fixed length(16-bit) integers:
* Connection Close error code
* Application Protocol Error Code in Reset Stream
* Application Error Code in Stop Sending

This typically makes reset stream and stop sending frames 1 byte larger than they need to be, which could be slightly annoying if one is churning through a huge number of streams.

It creates some unnecessary oddness in the HTTP/3 spec, where the HTTP_MALFORMED_FRAME(0x01XX) is describing a frame type that's a varint.  Admittedly, there would still be a limit of 2^60 being expressible, but it's easy to avoid that.

I think all 3 fields would be better as a varint, given our recent decisions to make HTTP/3 all varints.

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