How Alt-Svc switches HTTP/2 clients to use HTTP/3 | The Backend Engineering Show

The Backend Engineering Show with Hussein Nasser

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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