hq Alt-Svc quic parameter and structured headers

[LPardue]

I think the current syntax of the "quic" parameter for hq Alt-Svc is, after recent changes, incompatible with structured headers. For reference, httpwg/http-extensions#281 provides history of the issue. This ticket highlights that HTTP/QUIC is now incompatible.

Please close this out if a non-issue.

[MikeBishop]

Technically, it's a non-issue, since Alt-Svc isn't defined to be a structured header. However, the goal is to track that draft as closely as reasonable, since it also represents a best practice. I'll take a look and see if there's a simple change that would bring us closer, but I also don't want change for change's sake.

[MikeBishop]

Seems like the simplest choice would be a comma-delimited quoted string, i.e.

quic = DQUOTE version-number [ "," version-number ] * DQUOTE
version-number = 1*8HEXDIG; hex-encoded QUIC version

That certainly makes it shorter and matches the guidance, at the price of updating everyone's parser again. What do folks think?

[LPardue]

I have no strong stake.

Good point about structured header / best common practice.

[ianswett]

So, oddly enough GQUIC has already started supporting the newly proposed IETF Alt-Svc, but if we're going to change it, sooner would be better. And if you change it again after this time, we'll probably start getting grumpy :)

But shorter and following best practices seem like general goodness.

[siyengar]

+1 on sooner the better.

[janaiyengar]

+1 -- Let's do this, and ASAP.

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