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WebTransport: Bidirectional Streams over HTTP/3

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WebTransport: QUIC streams exposed to the browser

WebTransport is a browser API that gives web applications direct access to QUIC's transport primitives: ordered bidirectional streams, unidirectional streams, and unreliable datagrams. It runs over HTTP/3 using an extended CONNECT mechanism.

Why it matters: WebSocket is limited to TCP's single ordered byte stream — one packet drop stalls everything. QUIC's independent streams eliminate head-of-line blocking, and datagrams enable true fire-and-forget messaging for real-time apps like games and media.

Packets in motion — click to inspect:

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