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> However, you can also advertise H3 support via Alt-Svc, so presumably you could do the same with TurboTLS. Alt-Svc is an http header, by the time you get htt
by SahAssar 4y ago
> However, you can also advertise H3 support via Alt-Svc, so presumably you could do the same with TurboTLS.
Alt-Svc is an http header, by the time you get http you already have TLS setup. In a Alt-Svc workflow you generally advertise h2 in TLS ALPN, then use Alt-Svc to advertise h3 capability in the headers of the first response, and then the client establishes a h3 connection and closes the h2 connection when it is ready (and the h2 connection does not have any queued requests). At least that is my understanding.
- ekr____ 4y agoYes, that's correct. Basically the only good way to have a "first contact" fast track setup like this is by priming in DNS. My point is that the situation is th same for TurboTLS and QUIC/H3 in this respect.
- SahAssar 4y agoI just meant that QUIC/H3 is beneficial even after you already have a connection, so upgrading an existing connection is a valid strategy. TurboTLS is only beneficial for establishing the connection, so it needs to have prior knowledge about the support to be useful at all.