S204STi

/*
  data (optional) - a JSON string to send with the request
*/

function ajax(method, url, handler, data) {
  var xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function(){
    if (this.readyState === 4) {
      if (this.status === 200) {
        handler(null, JSON.parse(this.responseText));