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What does WebTransport do that WebSockets do not do? How is performance comparatively?

WebSockets is built on top of TCP, whereas WebTransport is built on top of UDP. This makes WebTransport better suited for handling latency-sensitive applications like multiplayer games.

https://github.com/cloudflare/quiche/issues/1114

Looks like no Rust HTTP/3 "WebTransport" support yet?

WebTransport and QUIC are different, right?

WebTransport is an HTTP/3 only protocol, and HTTP/3 is a QUIC only protocol. Different but interlinked.

UDP -> QUIC -> HTTP/3 -> WebTransport?

Correct

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