Method on_update

src/werkzeug/test.py:509–510

(d: CallbackDict[str, str])

        """

        def on_update(d: CallbackDict[str, str]) -> None:
            self.headers["Content-Type"] = dump_options_header(self.mimetype, d)

        d = parse_options_header(self.headers.get("content-type", ""))[1]
        return CallbackDict(d, on_update)