self.root_path_in_servers = root_path_in_servers
        self.docs_url = docs_url
        self.redoc_url = redoc_url
        self.swagger_ui_oauth2_redirect_url = swagger_ui_oauth2_redirect_url
        self.swagger_ui_init_oauth = swagger_ui_init_oauth
        self.swagger_ui_parameters = swagger_ui_parameters
        self.servers = servers or []
        self.separate_input_output_schemas = separate_input_output_schemas

                be a Pydantic model, it could be other things, like a `list`, `dict`,
                etc.

                It will be used for:

                * Documentation: the generated OpenAPI (and the UI at `/docs`) will
                    show it as the response (JSON Schema).
                * Serialization: you could return an arbitrary object and the