Handler for request is stream or not.
        :param request: Request object
        :return: bool

def is_stream_handler(self, request):
        """ Handler for request is stream or not.
        :param request: Request object
        :return: bool
        """
        try:
            handler = self.get(request)[0]
        except (NotFound, MethodNotSupported):
            return False
        if hasattr(handler, "view_class") and hasattr(
            handler.view_class, request.method.lower()
        ):
            handler = getattr(handler.view_class, request.method.lower())
        return hasattr(handler, "is_stream")