npm install http-response-object

var Response = require('http-response-object');
var res = new Response(200, {}, new Buffer('A ok'), 'http://example.com');
//res.statusCode === 200
//res.headers === {}
//res.body === new Buffer('A ok')
//res.url === 'http://example.com'
res.getBody();
// => new Buffer('A ok')

var res = new Response(404, {'Header': 'value'}, new Buffer('Wheres this page'), 'http://example.com');
//res.statusCode === 404
//res.headers === {header: 'value'}
//res.body === new Buffer('Wheres this page')
//res.url === 'http://example.com'
res.getBody();
// => throws error with `statusCode`, `headers`, `body` and `url` properties copied from the response