Many outdated tutorials will tell you that you need to add the below code to your server in order for socket.io code to work.

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io.configure(function () {
    io.set("transports", ["xhr-polling"]);
    io.set("polling duration", 10);
});

However, in newer versions of socket.io (v1.x.x), the set() and configure() methods are deprecated, as outlined here, and they result in the error “io.configure is not a function”. Instead, you should pass in the settings when you initialize the instance, like this:

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var io = require('socket.io')({
    "transports" : ["xhr-polling"],
    "polling duration" : 10
}).listen(server);

Also, in your client code you should use the “ws” protocol instead of “http” when trying to connect.

That should be all you need to get your app running!