def ok(self, data, schema=None, envelope=None):
        """
        Gets a 200 response with the specified data.

        :param data: The content value.
        :param schema: The schema to serialize the data.
        :param envelope: The key used to envelope the data.
        :return: A Flask response object.
        """

        data = marshal(data, schema, envelope)
        return self.__make_response(data)