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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