def exception_handler(
        self,
        exc_class_or_status_code: Annotated[
            Union[int, Type[Exception]],
            Doc(
                """
                The Exception class this would handle, or a status code.
                """
            ),
        ],
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        """
        Add an exception handler to the app.

                """
                Default function handler for this router. Used to handle
                404 Not Found errors.
                """
            ),
        ] = None,
        dependency_overrides_provider: Annotated[
            Optional[Any],
            Doc(
                """
                Only used internally by FastAPI to handle dependency overrides.