How to set up http3 on a localhost

[francislavoie]

@rimtas123

    ports:
      - 80:80
      - 443:443

You need to bind UDP as well. By default, only TCP is bound with docker-compose.

See the docs:

Keep Caddy Running - Caddy Documentation

@rimtas123

caddy | {"level":"info","ts":1671669449.0887034,"msg":"failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/lucas-clemente/quic-go/wiki/UDP-Receive-Buffer-Size for details."}

Make sure to follow these instructions so that you get proper HTTP/3 performance. You need to do those things on the host machine.