Use the 'route' decorator to use the 'methods' argument.

Raise code

        if mode not in {"r", "rt", "rb"}:
            raise ValueError("Resources can only be opened for reading.")

        return open(os.path.join(self.root_path, resource), mode)

    def _method_route(self, method: str, rule: str, options: dict) -> t.Callable:
        if "methods" in options:
            raise TypeError("Use the 'route' decorator to use the 'methods' argument.")

        return self.route(rule, methods=[method], **options)

    def get(self, rule: str, **options: t.Any) -> t.Callable:
        """Shortcut for :meth:`route` with ``methods=["GET"]``.

        .. versionadded:: 2.0 """