code: protected function doExecute()
      {
          // Prepare some variables that come in handy in apps
          extract($this->variables);
      
          // Set the arguments
          $arguments = $this->arguments;
  
          // Get the app to execute
          $path = $this->app;
  
          self::$logger->debug("Including {0}", [$path]);
          $resp = include $path;
  
          return $resp;
      }
docs: A wrapper to execute / include the selected route.  It puts the
  app in a private scope, which access to a set of predefined variables.
  
  @param string $path The file to execute
  @return mixed The response produced by the script, if any