javascript - NodeJS with Socket.IO delay emitting data

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javascript - NodeJS with Socket.IO delay emitting data

posted Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

javascript - NodeJS with Socket.IO delay emitting data

I am using the example from the Socket.IO homepage (http://socket.io/). It works and everything, but there is a huge delay between the time data is sent, and when that data is received on the other end.

I am using XAMPP, I have socket.html in my dir, and navigate to it using "http://localhost/socket.html" in my browser, and I have the server listening on port 8080.

Server:

var io = require('socket.io').listen(8080);

io.sockets.on('connection', function (socket) {
 socket.emit('news', { hello: 'world' });
 socket.on('my other event', function (data) {
   console.log(data);
 });
});

HTML File:

<html>
<head>
    <script src="http://localhost:8080/socket.io/socket.io.js"></script>
    <script>
      var socket = io.connect('http://localhost:8080');
      socket.on('news', function (data) {
        console.log(data);
        socket.emit('my other event', { my: 'data' });
      });
    </script>
</head>

<body>

</body>
</html>

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1 Reply

深蓝 · Answer 1 · 2021-10-23T19:24:54+0000

I have found the problem.

In the server I changed:

var io = require('socket.io').listen(8080);

to

var io = require('socket.io', { rememberTransport: false, transports: ['WebSocket', 'Flash Socket', 'AJAX long-polling'] }).listen(8080);

which forces the server to use either WebSockets, Flash Sockets, or long-polling. It wil try to use those in that order. The rememberTransport forces the server and client to forget which connection it used last, and try to connect with the 'transports' above.

On the client side I just pretty much did the same thing. I added:

{ rememberTransport: false, transports: ['WebSocket', 'Flash Socket', 'AJAX long-polling']}

to the socket constructor. So it looked like:

var socket = io.connect('http://localhost:843', { rememberTransport: false, transports: ['WebSocket', 'Flash Socket', 'AJAX long-polling']});

Now it seems to work perfectly.

Thanks guys.

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javascript - NodeJS with Socket.IO delay emitting data

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