nginx

nginx_websocket_reverse_proxy

map $http_upgrade $connection_upgrade {
        default         "upgrade";
        ""                      "";
}

server {
        listen 80;

        location / {
                proxy_pass                      http://docker;
                proxy_http_version      1.1;

                proxy_set_header        Connection                      $connection_upgrade;
                proxy_set_header        Upgrade                         $http_upgrade;
                proxy_set_header        Host                            $host;
                proxy_set_header        X-Real-IP                       $remote_addr;
                proxy_set_header        X-Forwarded-For         $proxy_add_x_forwarded_for;
        }
}