Websocket and CSRF Issues

This caddy config seems to work perfectly:

 example.com {
        @websockets {
                header Connection *Upgrade*
                header Upgrade websocket
        }
        reverse_proxy /cable 127.0.0.1:3000
        reverse_proxy @websockets 127.0.0.1:6042
        reverse_proxy 127.0.0.1:3000
        encode zstd gzip
}