Node:504 error reporting

Problems encountered ：
The project can start , But an error is reported as soon as the access interface ;
Someone on the Internet said it was necessary to reduce node edition ;
The final solution is ： The reason for the mistake is , The project uses agents , The agent is turned on ws（websocket）, I can't connect to , So it created node.js The collapse of the , Guaranteed to connect , Or shut down ws That's all right. .