[AC-3721] TiHTTPClient java.lang.NullPointerException

   var url = "http://mockbin.com/request?foo=bar&foo=baz";
   var client = Ti.Network.createHTTPClient({
       // function called when the response data is available
       onload: function(e) {
           Ti.API.info("Received text: " + this.responseText);
           alert('success');
       },
       // function called when an error occurs, including a timeout
       onerror: function(e) {
           Ti.API.debug(e.error);
           alert('error');
       },
       timeout: 5000 // in milliseconds
   });
   // Prepare the connection.
   //client.open("POST", url);
   client.open("POST", url);
   //Set headers here.
   //client.setRequestHeader('Content-Type','text/csv');
   client.send({
       "type": "getcategories",
       "sourcetype": "source_app",
   });