WWW data acquisition from remote server failing

I've started using LitJSON for my processing needs, and (quickly) built a Net Access layer to acquire data from a remote source. My Net Access Layer looks like this:

NET Access Layer

 using UnityEngine;
 using System;
 using System.Collections;
 using LitJson;

 [Serializable]
 public class ServerConnector : IDisposable
 {
 #region Variables / Properties
 
 public string Address { get; private set; }
 public bool AssetAcquired { get; private set; }
 private WWW _payload;
 
 #endregion Variables / Properties
 
 #region Constructor
 
 public ServerConnector(string address)
 {
     if(string.IsNullOrEmpty(address))
         throw new ArgumentNullException("address");
     
     Address = address;
     DownloadPayload();
 }
 
 #endregion Constructor
 
 #region Static Methods
 
 public static T UnpackJSONFromSource< T >(string address)
 {
     if(string.IsNullOrEmpty(address))
         throw new ArgumentNullException("address");
     
     T result = default(T);
     using(ServerConnector connector = new ServerConnector(address))
     {
         if(connector.AssetAcquired)
         {
             result = connector.UnpackJSON< T >();
         }
     }
     
     return result;
 }
 
 #endregion Static Methods
  
 #region Methods
 
 public void Dispose()
 {
     if(_payload != null)
         _payload = null;
 }
         
 public string GetTextData()
 {
     return _payload.text;
 }
 
 public T UnpackJSON< T >()
 {
     Debug.Log("Payload: " + _payload);
     T result = JsonMapper.ToObject< T >(_payload.text);
     return result;
 }
 
 private IEnumerator DownloadPayload()
 {    
     _payload = new WWW(Address);
     yield return _payload;
     
     if(_payload == null)
     {
         Debug.LogError("Failed to get the payload.");
         AssetAcquired = false;
         return true;
     }

     if(_payload.error != null)
     {
         Debug.LogError("Error occurred during download from " + Address + ": " + _payload.error);
         AssetAcquired = false;
     }
     else
     {
         AssetAcquired = true;
     }
 }
 
 #endregion Methods
 }

Naturally, to test that this is working correctly, I created a single game object in a scene, with the following behavior:

Test Behavior

 using UnityEngine;
 using System.Collections;

 public class NetLayerTest : MonoBehaviour 
 {    
 #region Variables / Properties
 
 private ServerConnector _connector;
 private string _secretMessage = "The secret message was not found or acquired.";
 
 #endregion Variables / Properties

 void Start () {
     _connector = new ServerConnector("http://andrewrgray.webs.com/dataz/test-data.json");
     
     Debug.Log("Address for download: " + _connector.Address);
     if(_connector.AssetAcquired)
         _secretMessage = _connector.UnpackJSON();
     
     Debug.Log(_secretMessage);
 }
  }

However, I notice whenever I start up in my test scene that I always get the Debug messages, "Failed to get the payload.", and "The secret message was not found or acquired." Long story short, my usage of WWW isn't getting any results!

I've made sure that the URL pointing to this JSON resource is correct (in fact, here it is), and that my usage of the WWW class in the Net Access layer is correct. I'm running my project in the editor, so I doubt that any interference from building as a webplayer is occurring (though, to rule that I out, I changed to a PC Any CPU build to be sure.)

Obviously, I am doing something totally wrong. The question is: what?

A note: This is my first time using WWW, so I made sure to consult the documentation first, and it did not yield enough information for me to discover the cause of the problem.