4:02:28 - 4:11:05 Making a Socket Connection Now that Socket.io is included in the Node application, Kyle walks through how to make a socket connection. He demonstrates the event-driven architecture by listening to connect and disconnect events on both the client and the server.

  <script>
    var socket = io.connect("/");
</script>

​io.connect("/")​ it's not a path, it's a namespace

  // continue from above
socket.on("connect", function(){
    console.log("connected");
})

in your server js file:

  function handleIO(socket){
    // "client connected"
}

io.on("connection", handleIO);

for every socket connection the ​handleIO​ will be called

  function handleIO(socket){
    function disconnect(){
        console.log("client disconnected");
    }
    socket.on("disconnect", disconnect);
}

handling disconnection on the client side (continued from the client example above)

  socket.on("disconnected", function(){
    console.log("disconnected");
})

to turn off verbose logging and good defaults

  // configure socket.io
io.configure(function(){
	io.enable("browser client minification"); // send minified client
	io.enable("browser client etag"); // apply etag caching logic based on version number
	io.set("log level", 1); // reduce logging
	io.set("transports", [
		"websocket",
		"xhr-polling",
		"jsonp-polling"
	]);
});