Node.js http file upload progress

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

http.createServer(function(req, res) {
  var newFile = fs.createWriteStream("uploaded.txt");
  var fileByte = req.headers['content-length'];
  var uploadedByte = 0;

  req.pipe(newFile);//from   w  w  w.  j a v a 2 s . co m

  req.on('data', function(data){
    uploadedByte += data.length;
    var progress = (uploadedByte/fileByte) * 100;
    res.write("Progress=" + progress + "%\n");
  });

  req.on('end', function() {
    res.end('uploaded!');
  });
}).listen(1337);

console.log('Server running at http://localhost:1337');