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Re: [quicwg/base-drafts] HTTP/QUIC without Alt-Svc? (#253)

"Philipp S. Tiesel" <notifications@github.com> Wed, 30 January 2019 10:01 UTC

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Subject: Re: [quicwg/base-drafts] HTTP/QUIC without Alt-Svc? (#253)
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@mikkelfj Putting the information whether QUIC is available in an ALTSVC DNS record does not eliminate the need for using Happy Eyeballs: If UDP to the announced port is blocked for the client, the client has to timeout otherwise. Still, having an ALTSVC DNS record would help to correctly tune the timings and probing probabilities for Happy Eyeballs.

@LPardue I see no problems with combining Happy Eyeballs and connection coalescing, but the relationship between them should really be defined somewhere. For me, connection coalescing opportunities are roughly the same thing as candidates for doing Happy Eyeballs, and should get as such at least 1 RTT advantage. So, in practice, try whether connection coalescing works, it it is slow or is behaving strangely, start making new connections with Happy Eyeballs.

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