protected function handleResponse($message = null, $code = null, $success = true, array $data = null)
 {
     if (!$success) {
         header('HTTP/1.1 500 Internal Server Error');
     }
     header('Content-Type: application/json');
     header(self::API_VER_HEADER . ': ' . self::API_VER);
     $latest_logs = null;
     try {
         $latest_logs = $this->module->getLatestLogLines();
     } catch (Exception $e) {
         //
     }
     echo json_encode(array('status' => $success ? 'OK' : 'KO', 'status_message' => $message, 'status_code' => $code, 'data' => (array) $data, 'request' => array_filter(array(isset($_POST) ? (array) $_POST : null, isset($_GET) ? (array) $_GET : null)), 'notify_apiver' => self::API_VER, 'sysinfo' => $this->module->getSysinfo(), 'log' => $latest_logs));
     exit(0);
 }