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Experimental WebTransport support for phoenix#6604

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lukaszsamson wants to merge 1 commit intophoenixframework:mainfrom
lukaszsamson:webtransport-implementation
Draft

Experimental WebTransport support for phoenix#6604
lukaszsamson wants to merge 1 commit intophoenixframework:mainfrom
lukaszsamson:webtransport-implementation

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This PR adds experimental WebTransport support in phoenix using cowboy backend with native quicer HTTP 3 library

Widespread WebTransport adoption on the browser side is still hindered by Safari (support landing on 26.4) (see https://caniuse.com/webtransport), cowboy HTTP 3 support is still immature and on the infra side QUIC traffic is another story so I don't expect this being a big priority soon

This repo https://github.com/lukaszsamson/phoenix_webtransport_demo has a demo app

Screenshot 2026-02-24 at 23 33 10 Screenshot 2026-02-24 at 23 34 18

@lukaszsamson lukaszsamson marked this pull request as draft February 24, 2026 22:40
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