How can I consume WebSocket messages in Node.js?

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Node.js

WebSockets

My task is to implement a Node.Js server ("my server") that will continuously read-in messages which are being emitted from several different websocket connections ("source servers", different URLs) and then process these messages somehow.

I was successful in the case of ws (or wss) connection, e.g. using the ws package in this case:

var WebSocket = require('ws'),
  ws = new WebSocket('wss://ws.pusherapp.com:443/app/__SECRET_API_CODE__');

ws.on('message', function(message) {
  console.log(message);
});

But the same approach does not work if the source server uses socket.io library, e.g. http://io.weplay.io (taken from http://socket.io/demos/weplay/).

Could somebody provide me a hint - I will appreciate any programming language - how to consume websocket messages from different source servers in my server application? Preferrably in an universal way, without depending on the concrete implementation of WebSocket protocol.

Thank you very much!