HttpRequest Works on iPad, Fails on MobileWeb

I've boiled an httpRequest down to the easiest testable model. Testing this on iPad returns the correct info from the server. Testing this on MobileWeb does not return anything except an error ('Can't Reach Host'). The server it is accessing is setup with CORS which I have confirmed on this site: http://client.cors-api.appspot.com/client

Titanium.UI.setBackgroundColor('#000');
 
var win1 = Titanium.UI.createWindow({  
    backgroundColor:'#fff'
});
 
win1.open();
 
var button = Ti.UI.createButton({width:200,height:50,title:'TEST'});
win1.add(button);
 
button.addEventListener('click',function(){
    var xhr = Titanium.Network.createHTTPClient();
    xhr.open('GET', 'http://remysharp.com/demo/cors.php');
    xhr.onerror = function(e){ 
        alert('Error ='+e.error);
    };
    xhr.onload = function(){
        alert('Response ='+this.responseText);
    };
    xhr.send(); 
});