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HTTP3 uses QUIC. QUIQ is UDP. Does this mean all router firewall rules for port 80 and 443 must be changed from TCP to UDP?

daniellooartist
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2 Answers2

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HTTP/3 with QUIC uses by default UDP port 443. There is no "plain text" (unencrypted) QUIC so no need for an additional UDP port 80 open.

It might be necessary though to keep TCP access for HTTP/1 and HTTP/2 available so that the site can announce support for HTTP/3 inside these protocols using the Alt-Svc header and thus the browser knows that it can switch to HTTP/3. So better don't remove the TCP rules.

Steffen Ullrich
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HTTP/3 using QUIC requires firewall rule for UDP ports 443 and 80.

Greg Askew
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