> For one thing, convection to a website via one of those protocols first, and then a header informs the client that it can reconnect via QUIC/HTTP3. Nit: new

> For one thing, convection to a website via one of those protocols first, and then a header informs the client that it can reconnect via QUIC/HTTP3. Nit: new SVCB DNS records can serve the same purpose as Alt-Svc HTTP headers before the initial request, so the first request to a server is HTTP/3. But yeah, HTTP/1.1 isn't going away (and shouldn't go away) for many reasons.