Why does the disconnect event fail in socket.io?

Question

JavaScript

There is quite a common structure on node.js + socket.io:

io.on('connection', function (socket) {

    socket.on('add user', function (hash, interlocutor_id) {

    });

    socket.on('private message', function (from, msg) {

    });

    socket.on('disconnect', function () {

    });
});

So the point is in a small chat with your custom requests. Everything works like this:
A user comes in, we get his socket, we check if his user_id is in the array, if not, he creates a room and pushes him there. If it is in the array, update the socket for it.
So everything works well until the moment when I start storming the f5 server. To finish eating I throw a small dos attack by holding F5. At some point after 20 - 30 requests, the disconnect event simply stops working.
Just in this event, the rooms are cleaned. And it turns out that the rooms are constantly replenished with duplicates.
I found a similar question on stackoverflow, where it was advised to do this:

var socket = io.connect(':8080', {'sync disconnect on unload': true});

Actually the problem is not solved. The disconnect event falls off and falls off with ends on all subsequent requests, how to be?

Answer 1

At least you don’t have to do it the way you do: https://toster.ru/answer?answer_id=477715