Method raise_routing_exception

src/flask/app.py:478–504

Intercept routing exceptions and possibly do something else. In debug mode, intercept a routing redirect and replace it with an error if the body will be discarded. With modern Werkzeug this shouldn't occur, since it now uses a 308 status which tells the browser to

(self, request: Request)

        return None

    def raise_routing_exception(self, request: Request) -> t.NoReturn:
        """Intercept routing exceptions and possibly do something else.

        In debug mode, intercept a routing redirect and replace it with
        an error if the body will be discarded.

        With modern Werkzeug this shouldn't occur, since it now uses a
        308 status which tells the browser to resend the method and
        body.

        .. versionchanged:: 2.1
            Don't intercept 307 and 308 redirects.

        :meta private:
        :internal:
        """
        if (
            not self.debug
            or not isinstance(request.routing_exception, RequestRedirect)
            or request.routing_exception.code in {307, 308}
            or request.method in {"GET", "HEAD", "OPTIONS"}
        ):
            raise request.routing_exception  # type: ignore[misc]

        from .debughelpers import FormDataRoutingRedirect

        raise FormDataRoutingRedirect(request)

    def update_template_context(self, context: dict[str, t.Any]) -> None:
        """Update the template context with some commonly used variables.