HTTP to WWW Help --Small Sample Code Conversion

Hey guys, seems that I have a similar problem as this guy: http://answers.unity3d.com/answers/1088100/view.html

I'm new to network programming, and can't for the life of me get this small batch of code to work. I attempted coverting what mojojo provided at the bottom of the page. I got a response, but couldn't get it to properly send back the json information. Here's that example below-feel free to respond on mojojo's question too. Thanks again, Here's DC's metro link with the code sample <- https://developer.wmata.com/docs/services/547636a6f9182302184cda78/operations/547636a6f918230da855363f

Here's Metros & Below it was my conversion attempt: METROS

 using System;
 using System.Net.Http.Headers;
 using System.Text;
 using System.Net.Http;
 using System.Web;
 namespace CSHttpClientSample
 {
     static class Program
     {
         static void Main()
         {
             MakeRequest();;
             Console.WriteLine("Hit ENTER to exit...");
             Console.ReadLine();
         }
         
         static async void MakeRequest()
         {
             var client = new HttpClient();
             var queryString = HttpUtility.ParseQueryString(string.Empty);
 
             // Request headers
             client.DefaultRequestHeaders.Add("api_key", "{subscription key}");
 
             var uri = "https://api.wmata.com/StationPrediction.svc/json/GetPrediction/{StationCodes}&" + queryString;
             var response = await client.GetAsync(uri);
         }
     }
 }    

MY CONVERSION:

 using UnityEngine;
  using System.Collections;
  using System.Collections.Generic;
  using System;
  using System.Net;
  using System.Text;
  
  public class GetListOfStationsPerLineVer3 : MonoBehaviour {
  
      public string SubscriptionKey = "ENTER_SUB_KEY_HERE"; //API Subkey is kept private for this example
      public string StationCode = "B03"; //Glenmont Station
 
      void Start(){
      StartCoroutine (MakeRequest ());
      Console.WriteLine ("Hit Enter to Exit...");
      Console.ReadLine ();
      }
  
      IEnumerator MakeRequest(){
          //string uri = WWW.EscapeURL ("https://api.wmata.com/StationPrediction.svc/GetPrediction/"+StationCode+"&",System.Text.Encoding.UTF8);
          string uri = "https://api.wmata.com/StationPrediction.svc/GetPrediction/" + StationCode + "&";
  
          Dictionary<string,string> headers = new Dictionary<string,string> ();
          headers.Add ("api_key", SubscriptionKey);
          headers ["Authorization"] = "Basic" +    System.Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes(SubscriptionKey));
          WWW wwwRequest = new WWW(uri, null, headers);  
          yield return wwwRequest;
  
          if(wwwRequest.error == null)
          {Debug.Log ("WWW ok!:"+wwwRequest.text);
          }else{
              Debug.Log ("WWW error!:"+wwwRequest.error+"the url is: " +uri);
          }
  
      }
  
  }