client.js

var http = require('http');

var options = {
  host: 'localhost',
  port: 3000,
  path: '/',
  method: 'POST'
};

var req = http.request(options, function(res) {
    res.on('data', function(data) {
        console.log(data + '');
        req.write(data + '\n');
    });
});

req.write('\n');

server.js

var express = require('express');

var app = express.createServer();

app.post('/', function(req, res, next) {
        console.log('new client!');

        res.writeHead(200, {
                        'Content-Type': 'application/json'
                        });

        setInterval(function() {
                res.write(Math.random() + '\n');
        }, 500);

        req.on('close', function() {
                console.log('client disconnected');
        });

	req.on('data', function(data) {
		console.log('client sent---> ' + data);
	});
});

app.listen(3000);