QUIC in the browser

Github

This demo runs the quinn QUIC implementation compiled to WASM in the browser. It forwards UDP packets over a WebSocket connection to a relay server, which then sends them out to the actual destination. All packets are end-to-end encrpyted between browser and the destination QUIC server; the relay cannot read anything.

Caveats:

The demo uses self-signed certificates without any checks, so it could be MITM'ed. This can be mitigated though by either shipping regular WebPKI certificates in the WASM bundle, or using P2P certificates, e.g. like Iroh Net
This currently needs a few patches to quinn and rustls. See the GitHub repo for details.
You likely do not want to run this as-is in production, because it will allow anyone to use your relay server to send any kind of UDP packet to any destination.

This demo only allows 127.0.0.1:4000 as QUIC host to prevent abuse! It runs the QUIC echo server from the repo example there.

Open the browser console for detailed logs!

QUIC in the browser

Output: