app.js

var http = require('http');
var url = require('url');
var fs = require("fs");
var path = require("path");

var server = http.createServer(function (request, response) {
   var pathname = url.parse(request.url).pathname;
    var realPath = "client" + pathname;

    path.exists(realPath, function (exists) {
        if (!exists) {
            response.writeHead(404, {'Content-Type': 'text/plain'});
            response.write("This request URL " + pathname + " was not found on this server.");
            response.end();
        } else {
            fs.readFile(realPath, "binary", function(err, file) {
                if (err) {
                    response.writeHead(500, {'Content-Type': 'text/plain'});
                    response.end(err);
                } else {
                    response.writeHead(200, {'Content-Type': 'text/html'});
                    response.write(file, "binary");
                    response.end();
                }
             });
          }
      });
}).listen(55555);

console.log('Server running at http://127.0.0.1:55555/');