HTTP

app.js

function easyHttp() {
  this.http = new XMLHttpRequest();
}

easyHttp.prototype.get = function (url, cb) {
  let self = this;

  self.http.open('GET', url, true);

  self.http.onload = function () {
    if (self.http.status === 200) {
      return cb(null, self.http.responseText);
    } else {
      return cb('Status ' + self.http.status);
    }
  };

  self.http.send();
};