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I thought I read somewhere that HTTP/3 can use UDP now. Thought I'm not sure if it can purely use UDP or if it needs to be bootstrapped by a TCP connection first.

It would be handy if the HTTP standard had some support for a minimal UDP connection for resource constrained webservers.

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HTTP/3 uses QUIC, which mandates TLS. This, and the general protocol specification which requires peers to store very detailed state about every packet sent, make it much more resource intensive than HTTP/1.1 over TCP.

Source: I implemented HTTP/3 support for a major cloud provider

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