File upload in Node.js to an Express server, using streams

client.js

// node: v0.10.21
// request: 2.27.0
var request = require('request');
var fs = require('fs');

var r = request.post("http://server.com:3000/");
// See http://nodejs.org/api/stream.html#stream_new_stream_readable_options
// for more information about the highWaterMark
// Basically, this will make the stream emit smaller chunks of data (ie. more precise upload state)
var upload = fs.createReadStream('f.jpg', { highWaterMark: 500 });

upload.pipe(r);

var upload_progress = 0;
upload.on("data", function (chunk) {
  upload_progress += chunk.length
  console.log(new Date(), upload_progress);
})

upload.on("end", function (res) {
  console.log('Finished');
})

server.js

// node: v0.10.7
// express: 3.4.4
var fs = require('fs');
var express = require('express');

var app = express();
app.post('/', function (req, res, next) {
  req.pipe(fs.createWriteStream('./uploadFile'));
  req.on('end', next);
});

app.listen(3000);