Max Inden recently explored in a talk at FOSDEM 2026 how the upcoming WebTransport protocol and Web API enhance WebSocket capabilities. WebTransport seeks to provide, among other things, lower latency

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Max Inden, a Mozilla Firefox networking developer, presented at FOSDEM 2026 on WebTransport as a potential successor to WebSockets. WebTransport leverages HTTP/3 and QUIC over UDP to address key WebSocket limitations: head-of-line blocking, slow connection setup (multiple RTTs), and broken connections during network switches. It supports both reliable streams and unreliable datagrams, enables transparent connection migration (e.g., Wi-Fi to cellular), and can establish connections in 1 RTT or even 0-RTT for returning users. Community reaction is mixed — many see WebTransport as a specialized tool rather than a drop-in WebSocket replacement, and its HTTPS-only requirement limits local use cases.

FOSDEM 2026: Intro to WebTransport - the Next WebSocket?!