def args(self):
        """The parsed URL parameters.  By default an
        :class:`~werkzeug.datastructures.ImmutableMultiDict`
        is returned from this function.  This can be changed by setting
        :attr:`parameter_storage_class` to a different type.  This might
        be necessary if the order of the form data is important.
        """
        return url_decode(wsgi_get_bytes(self.environ.get('QUERY_STRING', '')),
                          self.url_charset, errors=self.encoding_errors,
                          cls=self.parameter_storage_class)