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