title: Bluemix push notification, got 400 when subscribeToTags
body: <p>I called <code>let push = IMFPushClient.sharedInstance()
          logger?.logInfoWithMessages("subscribe to tags: \(tagsArray)")
          push.subscribeToTags([tagsArray]) { (response: IMFResponse!, error: NSError!) -&gt; Void in
  </code>to subscribe to a tag, but got 400 from the stacktrace.</p>
  
  <pre><code>2016-01-22 16:48:10.648 gschat-swift[44084:5194666] [INFO] [BlueList] subscribe to tags: ["Test"]
  2016-01-22 16:48:10.648 gschat-swift[44084:5194666] [INFO] [IMFPushClient] -[IMFPushClient subscribeToTags:completionHandler:] in IMFPushClient.m:314 :: Entering: subscribeToTags.
  2016-01-22 16:48:10.650 gschat-swift[44084:5194666] [DEBUG] [IMF] +[WLAFHTTPClientWrapper requestWithURL:] in WLAFHTTPClientWrapper.m:44 :: Request url is https://ChatBMS.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions
  2016-01-22 16:48:10.653 gschat-swift[44084:5194666] [DEBUG] [IMF] -[WLAFHTTPClientWrapper start] in WLAFHTTPClientWrapper.m:194 :: Starting the request with URL https://ChatBMS.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions
  2016-01-22 16:48:11.255 gschat-swift[44084:5194362] [DEBUG] [IMF] -[WLAFHTTPClientWrapper requestFailed:error:] in WLAFHTTPClientWrapper.m:215 :: Request Failed
  2016-01-22 16:48:11.256 gschat-swift[44084:5194362] [DEBUG] [IMF] -[WLAFHTTPClientWrapper requestFailed:error:] in WLAFHTTPClientWrapper.m:216 :: Response Status Code : 400
  2016-01-22 16:48:11.257 gschat-swift[44084:5194362] [DEBUG] [IMF] -[WLAFHTTPClientWrapper requestFailed:error:] in WLAFHTTPClientWrapper.m:217 :: Response Error : Expected status code in (200-299), got 400
  2016-01-22 16:48:11.259 gschat-swift[44084:5194362] [ERROR] [IMFPushClient] __51-[IMFPushClient subscribeToTags:completionHandler:]_block_invoke in IMFPushClient.m:350 :: Error while subscribing to tags - Error is: Error Domain=WLAFNetworkingErrorDomain Code=-1011 "Expected status code in (200-299), got 400" UserInfo={WLAFNetworkingOperationFailingURLRequestErrorKey=&lt;NSMutableURLRequest: 0x7f89b8d8dd10&gt; { URL: https://ChatBMS.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions }, NSLocalizedRecoverySuggestion={"message":"Bad Request - Invalid JSON","code":"FPWSE0004E"}, NSErrorFailingURLKey=https://ChatBMS.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions, WLAFNetworkingOperationFailingURLResponseErrorKey=&lt;NSHTTPURLResponse: 0x7f89b8eb7f00&gt; { URL: https://chatbms.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions } { status code: 400, headers {
      Connection = "Keep-Alive";
      "Content-Type" = "application/json";
      Date = "Fri, 22 Jan 2016 16:48:09 GMT";
      "Transfer-Encoding" = Identity;
      "X-Backside-Transport" = "FAIL FAIL";
      "X-Cf-Requestid" = "cf162009-bd95-46d2-46ca-3cad50a70153";
      "X-Client-IP" = "80.111.218.187";
      "X-Global-Transaction-ID" = 2240839783;
      "X-Powered-By" = "Servlet/3.0";
  } }, NSLocalizedDescription=Expected status code in (200-299), got 400}
  2016-01-22 16:48:11.260 **gschat-swift[44084:5194362] [FATAL] [BlueList] error Error Domain=com.ibm.mobilefoundation.push Code=10 "Expected status code in (200-299), got 400" UserInfo={WLAFNetworkingOperationFailingURLRequestErrorKey=&lt;NSMutableURLRequest: 0x7f89b8d8dd10&gt; { URL: https://ChatBMS.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions }, NSLocalizedRecoverySuggestion={"message":"Bad Request - Invalid JSON","code":"FPWSE0004E"}, NSErrorFailingURLKey=https://ChatBMS.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions, WLAFNetworkingOperationFailingURLResponseErrorKey=&lt;NSHTTPURLResponse: 0x7f89b8eb7f00&gt; { URL: https://chatbms.mybluemix.net/imfpush/v1/apps/2b7d11a9-57bf-47e6-8a4c-8aabf044ac8a/subscriptions } { status code: 400, headers {
      Connection = "Keep-Alive";
      "Content-Type" = "application/json";
      Date = "Fri, 22 Jan 2016 16:48:09 GMT";
      "Transfer-Encoding" = Identity;
      "X-Backside-Transport" = "FAIL FAIL";
      "X-Cf-Requestid" = "cf162009-bd95-46d2-46ca-3cad50a70153";
      "X-Client-IP" = "80.111.218.187";
      "X-Global-Transaction-ID" = 2240839783;
      "X-Powered-By" = "Servlet/3.0";
  } }, NSLocalizedDescription=Expected status code in (200-299), got 400} in subscribe to tags:["Test"]**
  </code></pre>