docs: def action_handler_adapter(handler_cls: type, action_name: str) -> Callable:
      """ wraps class to wsgi application dispathing action"""
  
      if not hasattr(handler_cls(), action_name):
          message = "{0} does'nt have attr:{1}".format(handler_cls, action_name)
          raise ValueError(message)
  
      def wsgiapp(environ, start_response):
          """ inner app """
          handler = handler_cls()
          return getattr(handler, action_name)(environ, start_response)
      return wsgiapp