How to get an XML file from a web service

I was trying to get the XML file from a local directory on my machine which worked perfectly with this code

        function loadXMLDoc()
       {

       var request;
       if (window.XMLHttpRequest) {
       request = new XMLHttpRequest();
       } 

     else {
     request = new ActiveXObject("Microsoft.XMLHTTP");
          }

     request.open('GET','simple.xml', true);
     request.onreadystatechange = function() {

        if ((request.readyState===4) && (request.status===200)) {

However, when I decide to upload the XML file to google drive for example using the below code, I dont get the desirable output:

        function loadXMLDoc()
       {

       var request;
       if (window.XMLHttpRequest) {
       request = new XMLHttpRequest();
       } 

     else {
     request = new ActiveXObject("Microsoft.XMLHTTP");
          }

     request.open('GET','http://ift.tt/1nd5MHQ', true);
     request.onreadystatechange = function() {

        if ((request.readyState===4) && (request.status===200)) {