demo.js

var express = require('express');
var app     = express();

app.use(function(req, res, next) {
  req.on('data', function() {
    console.log('read chunk');
  });
  req.on('end', function() {
    console.log('req end');
    next();
  });
});

app.use(express.bodyParser());

app.all('/', function(req, res) {
  res.send('OK');
});

app.listen(3012);