text: var async = require('async'),
  request = require('request');
  function done(err, res, body) {
  	if (err) {
  		throw err;
  	}
  	console.log("3^4 = %d", body);
  }
  async.waterfall([
  	function(next) {
  		request.post({uri: 'http://localhost:4000', body: "3"}, next)
  	},
  	function(res, body, next) {
  		request.post({uri: 'http://localhost:4000', body: body}, next);
  	}
  ], done);
  