Websocket on nodejs. Problem with "close" event?

Question

Node.js

I am writing a chat using websocket on nodejs. For websocket I use the module for ws . When the chat window is closed, the connection disconnection event on the server is triggered with a 10-30 second delay. How to fix it? The third day I'm struggling with a solution, I've run out of ideas.

Answer 1

Partially solved the problem. Such a script closes the websocket when the page is cleanly closed and the server immediately catches the event.

window.onunload = function(){
    ws.close();
};

For the case when the connection is interrupted not due to a clean closing of the browser or page, a delay of 10-30 seconds is not so terrible.