[911] Callback on rendered to disconnect socket

Hi guys,

I have tried your socket.io example and found out that each rendering creates new presistent socket conection to the server. To reproduce it you shall change io.on in server.js as follows:

io.on('connection', (socket) => {
  socket.on('last-messages', function (fn) {
    fn(messages.slice(-50))
  });
  socket.on('send-message', function (message) {
    messages.push(message)
    socket.broadcast.emit('new-message', message)
  });
  console.log(Object.keys(io.sockets.clients().connected)); <-- new code
});

In the console you will see, that open connections list is growing on each page rendering.

I would like to ask if there is a way to listen to event when rendering is finished and run callback to close sockets connection?

The current solution i see is to use setTimeout(callback, 60*1000) for example.