do_reverseproxy/sites-available/fhem-dev.nginx

# Fhem server configuration
server {
		listen 80;
		server_name fhem-dev.metzner.myhome-server.de;

		access_log            /var/log/nginx/fhem-dev.metzner.access.log;
		error_log            /var/log/nginx/fhem-dev.metzner.error.log;

		location / {
                        set $myHttpUpgrade "";
                        set $myConnection "Connection";

			proxy_set_header        Host $host;
			proxy_set_header        X-Real-IP $remote_addr;
			proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
			proxy_set_header        X-Forwarded-Proto $scheme;
                        proxy_http_version      1.1;

                        if ($http_upgrade = "websocket") {
                          set $myHttpUpgrade $http_upgrade;
                          set $myConnection "upgrade";
                        }

                        proxy_set_header Upgrade $myHttpUpgrade;
                        proxy_set_header Connection $myConnection;
                        proxy_pass          http://192.168.1.146:8083;
			#proxy_read_timeout  90;
		}
	}