title: java.io.IOException: Received authentication challenge is null in ICS 4.0.3
body: <p>I'm trying to logoff from the server. But it returns "0" response code with this exception. I'm using GET verb to do this.</p>
  
  <p><b>LogCat</b></p>
  
  <pre><code>10-17 14:54:13.261: W/System.err(868): java.io.IOException: Received authentication challenge is null
  10-17 14:54:13.284: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.processAuthHeader(HttpURLConnectionImpl.java:397)
  10-17 14:54:13.284: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.processResponseHeaders(HttpURLConnectionImpl.java:345)
  10-17 14:54:13.304: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:276)
  10-17 14:54:13.324: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:479)
  10-17 14:54:13.324: W/System.err(868):  at com.remote.synchronizer.haris.CustomHttpClient.executeGet(CustomHttpClient.java:131)
  10-17 14:54:13.354: W/System.err(868):  at com.remote.synchronizer.haris.OptionsActivity$1$3$1.run(OptionsActivity.java:87)
  10-17 14:54:13.364: W/System.err(868):  at android.os.Handler.handleCallback(Handler.java:605)
  10-17 14:54:13.384: W/System.err(868):  at android.os.Handler.dispatchMessage(Handler.java:92)
  10-17 14:54:13.384: W/System.err(868):  at android.os.Looper.loop(Looper.java:137)
  10-17 14:54:13.404: W/System.err(868):  at android.app.ActivityThread.main(ActivityThread.java:4424)
  10-17 14:54:13.424: W/System.err(868):  at java.lang.reflect.Method.invokeNative(Native Method)
  10-17 14:54:13.424: W/System.err(868):  at java.lang.reflect.Method.invoke(Method.java:511)
  10-17 14:54:13.454: W/System.err(868):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  10-17 14:54:13.474: W/System.err(868):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  10-17 14:54:13.474: W/System.err(868):  at dalvik.system.NativeStart.main(Native Method)
  10-17 14:54:13.484: E/HTTP Response(868): java.io.IOException: Received authentication challenge is null
  </code></pre>
  
  <p><b>CustomHttpClient.java</b></p>
  
  <pre><code>public class CustomHttpClient {
  
      static HttpClient client = new DefaultHttpClient();
      static HttpURLConnection connection = null; 
  
      public static int executePost(String url, String postParameters)
      {
          int response=0;
  
          OutputStream output = null;
          try
          {
              connection = (HttpURLConnection)new URL(url).openConnection();
              System.setProperty("http.keepAlive", "false");
              connection.setDoOutput(true);
              connection.setRequestMethod("POST");
              connection.setRequestProperty("Accept-Charset", "UTF-8");
              connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
  
              connection.connect();
  
              output = connection.getOutputStream();
              output.write(postParameters.getBytes("UTF-8"));
  
              response=connection.getResponseCode();
          }
          catch(Exception e)
          {
              e.printStackTrace();
              Log.e("HTTP Response", e.toString());
          }
          finally {
              if(connection != null) {
                  //  connection.disconnect(); 
                  if (output != null) 
                      try { output.close(); } 
                  catch (IOException logOrIgnore) {}
              }
          }
  
          return response;
      }
  
      public static int executeGet(String url)
      {
          int response=0;
  
          //HttpURLConnection connection = null;
          try
          {
              connection = (HttpURLConnection) new URL(url).openConnection();
              System.setProperty("http.keepAlive", "false");
              //connection.setRequestProperty("Accept-Charset", "UTF-8");
              connection.setDoInput(true);
              connection.setRequestMethod("GET");
              connection.connect();
              response=connection.getResponseCode();
          } 
          catch(Exception e)
          {
              e.printStackTrace();
              Log.e("HTTP Response", e.toString());
          }
          finally {
              if(connection != null) {
                  //  connection.disconnect();
              }
          }
          return response;
      }
  
  }
  </code></pre>
  
  <p>Before this I'm using DefaultHTTPClient in Gingerbird 2.3 its working perfectly but in ICS DefaultHTTPClient is not working so I need to use HttpURLConnection. POST verb is working fine.</p>