simple node json http request function with promises and no dependencies

request.js

'use strict';

let http  = require('http');
let https = require('https');
let parseUrl = require('url').parse;

function concat (stream, callback) {
  var strings = [];
  stream.on('data', function (data) {
    strings.push(data);
  });
  stream.on('end', function () {
    callback(strings.join(''));
  });
}

function request (method, url, payload) {
  return new Promise(function (fulfill, reject) {
    url = parseUrl(url);
    let req = (url.protocol === 'https:' ? https : http).request({
      hostname: url.hostname,
      path:     url.path,
      method:   method
    }, function (res) {
      concat(res, function (data) {
        if (res.statusCode >= 200 && res.statusCode < 300) fulfill(data);
        else reject(data);
      });
    });

    req.on('error', reject);

    if (payload) {
      let body = JSON.stringify(payload);
      req.setHeader('Content-Length', Buffer.byteLength(body));
      req.write(body);
    }

    req.end();
  });
}

module.exports = request;
module.exports.get    = function (url, payload) { request('GET', url, payload); };
module.exports.post   = function (url, payload) { request('POST', url, payload); };
module.exports.put    = function (url, payload) { request('PUT', url, payload); };
module.exports.patch  = function (url, payload) { request('PATCH', url, payload); };
module.exports.delete = function (url, payload) { request('DELETE', url, payload); };

request('POST', 'https://api.myapp.com', {foo: 'bar'});
request('GET', 'https://www.google.com').then(function (body) {
  console.log(body);
});