grpc web prototype

[soyuka]

This uses github.com/soyuka/grpcweb instead of improbable-eng/grpc-web as caddy already has the whole http layer.

[mholt]

I love deleting code. Thanks for the improvement!!

[mholt]

Forgot something

[mholt]

Oops, but before we can merge, the go.mod will need to be fixed.

[soyuka]

I think we should completely drop the websocket code as it is not supported nor recommended by grpcweb see https://github.com/grpc/grpc-web/blob/70268fa6e2e1c31949305bd6dc14098c821fef58/doc/streaming-roadmap.md?plain=1#L25

[mholt]

I'm good with removing it; I don't know anyone using that feature, and we're not bound to compatibility guarantees here (yet) since we clearly document this as experimental and subject to change.

Anyway, this LGTM, or if we want to remove websockets now I can wait to merge this until that is ready 👍

[soyuka]

I will test that and report :)

[mholt]

Great! It's looking good now. Let me know when you're ready to merge.

[soyuka]

Tested at https://github.com/soyuka/caddy-grpc/tree/main/testdata

Basically with github.com/soyuka/caddy-grpc you can have your grpc server directly handled by caddy (globally the same as with frankenphp-grpc but without php ^^):

{
    grpc {
        address :50051
    }
}

localhost {
    route {
        grpc_web
        reverse_proxy h2c://127.0.0.1:50051
    }
}

[mholt]

Awesome, lgtm. Thanks again!!