How Alt-Svc switches HTTP/2 clients to use HTTP/3

The Alt-Svc header/frame is a capability that allows the server to adverse alternative services to the connected application available in protocols, ports or domains. It is available as a response header alt-svc and also as an HTTP/2 frame. Let us discuss this capability.

0:00 Intro
1:38 what is alt-svc?
5:30 uses of h3 in alt-svc
8:00 alt-svc header
10:00 Alt-svc header with 103 early hints
14:48 h2 altsvc frame
18:30 SVCB DNS record
21:20 Summary

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