code: def _request_address(self):
          
          if not self._request_address_val:
              template = (
                  'https://sb-ssl.google.com/safebrowsing/api/lookup'
                  '?client={0}&key={1}&appver={2}&pver={3}'
              )
              self._request_address_val = template.format(
                  self.client_name,
                  self.api_key,
                  self.app_version,
                  self.protocol_version
              )
          return self._request_address_val
docs: Get address of a POST request to the service.