A server highlighting bug https://github.com/LearnBoost/socket.io/issues/430

server.js

var express = require('express');
var io = require('socket.io');

var http = require('http');
var fs = require('fs');

http.createServer(function (request, response) {

    console.log('request ' + request.url);

    fs.readFile('.' + request.url, function(error, content) {
        if (error) {
            response.writeHead(500);
            response.end();
        }
        else {
            response.writeHead(200, { 'Content-Type': 'text/html' });
            response.end(content, 'utf-8');
        }
    });

}).listen(8125);

var app = express.createServer();
var io = io.listen(app);

app.listen(8088);

var clientCount = 0;

io.sockets.on('connection', function (socket) {
    socket.set('clientCount', clientCount);
    console.log('new client: ' + clientCount);
    clientCount += 1;

    socket.on('heartbeat', function (count) {
        socket.get('clientCount', function (err, clientCount)
        {
            console.log(clientCount + ': Heartbeat ' + count);
        });

    });

    socket.on('disconnect', function (count) {
        socket.get('clientCount', function (err, clientCount)
        {
            console.log('client disconnect: ' + clientCount);
        });
    });
});