XHR is a mess!

ajax.js

if (window.XMLHttpRequest) {
  request = new XMLHttpRequest();
} else if (window.ActiveXObject) {
  try {
    request = new ActiveXObject('Msxml2.XMLHTTP');
  } 
  catch (e) {
    try {
      request = new ActiveXObject('Microsoft.XMLHTTP');
    } 
    catch (e) {}
  }
}

request.open('GET', 'https://api.github.com/users/leandroh', true);
request.send(null);