Request to add HTTP3 flag (optional)

[tkreindler]

With HTTP3 being supported on all browsers now and widely useful, it'd be nice to have an environment variable you can optionally pass to the container to add

{
experimental_http3
}

to the Caddyfile and enable http3.

[francislavoie]

Just add global options as a label to your caddy-docker-proxy service. No need for anything extra.

caddy.servers.protocol.experimental_http3: ""

Be aware that the syntax for this global option is changed since v2.3.0, it's now nested within servers. See the docs:

https://caddyserver.com/docs/caddyfile/options

[seonglae]

Is global option by labels still available? I added http3 label to caddy service but protocol is still h2!

I'm using lucaslorentz/caddy-docker-proxy:2.4-alpine

[francislavoie]

Yes, see the README for how to configure global options.

Make sure you review the Global Options docs on the Caddy website for how to configure experimental_http3, it's nested a couple levels deeper.

[emilylange]

@seonglae

I added http3 label to caddy service but protocol is still h2!

The caddy-docker-proxy plugin leverages reloads, which seem to be broken with http/3 at the moment.
See caddyserver/caddy#4348 and caddyserver/caddy#4413 for more information :)