test.js

var http = require('http');

var options = {
  host: 'url',
  port: 80,
  path: 'path',
  method: 'POST'
};

var req = function(callback) { 
  http.request(options, function(res) {
    res.setEncoding('utf8');
    res.on('data', function (chunk) {
      console.log("Body: " + chunk);
    });
  });
  callback(res);
}

req(function(res) {
 //Do stuff
});

req.on('error', function(e) {
  console.log('problem with request: ' + e.message);
});

req.write('data\n');
req.end();