server.js

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

var workers = 1;

if (cluster.isMaster) {
  for (var i = 0; i < workers; ++i) {
    cluster.fork();
  }
} else {
  http.createServer(function (req, res) {
    if (req.url == '/test') {
      res.writeHead(200, {
        'Set-Cookie': 'foo=bar'
      });
      res.end(req.headers['x-test'])
		} else if (req.url == '/json') {
			var body = [];
			req.on('data', function(chunk) {
				body.push(chunk);
			}).on('end', function() {
				body = Buffer.concat(body).toString();

				console.log(body);

				res.writeHead(200, {});
				res.end(JSON.stringify({ bar: 'foo' }));
			});
    } else {
      console.log(req.method + ' ' + req.url)
      console.log(req.headers)

      res.writeHead(200, {
        'X-Foo': ['bar', 'baz'],
      });
      res.end('test');
    }
  }).listen(9090, '127.0.0.1');
}