def if_match(self, values):
        """
        Set the If-Match option of a request.

        :param values: the If-Match values
        :type values : list
        """
        assert isinstance(values, list)
        for v in values:
            option = Option()
            option.number = defines.OptionRegistry.IF_MATCH.number
            option.value = v
            self.add_option(option)
Set the If-Match option of a request.

        :param values: the If-Match values
        :type values : list