Fix websocket not found error message

nginx/default.conf

@@ -22,7 +22,7 @@ server {
 
   # https://stackoverflow.com/questions/70585472/websocketclient-js16-websocket-connection-to-ws-localhost3000-ws-failed-r
   location /ws {
-    proxy_pass http://frontend/;
+    proxy_pass http://frontend;
     proxy_http_version 1.1;
     proxy_set_header Upgrade $http_upgrade;
     proxy_set_header Connection "upgrade";