code: def is_safe(self):
          
          if self._number == defines.OptionRegistry.URI_HOST.number \
                  or self._number == defines.OptionRegistry.URI_PORT.number \
                  or self._number == defines.OptionRegistry.URI_PATH.number \
                  or self._number == defines.OptionRegistry.MAX_AGE.number \
                  or self._number == defines.OptionRegistry.URI_QUERY.number \
                  or self._number == defines.OptionRegistry.PROXY_URI.number \
                  or self._number == defines.OptionRegistry.PROXY_SCHEME.number:
              return False
          return True
docs: Check if the option is safe.
  
          :rtype : bool
          :return: True, if option is safe