code: def convert(self, request, response, data):
          
  
          client_addr = request.environ.get('REMOTE_ADDR', '-')
          if (self.modifier.param != 'c' and
                  'bark.useragent_ip' in request.environ):
              client_addr = request.environ['bark.useragent_ip']
  
          return client_addr
docs: Performs the desired Conversion.
  
          :param request: The webob Request object describing the
                          request.
          :param response: The webob Response object describing the
                           response.
          :param data: The data dictionary returned by the prepare()
                       method.
  
          :returns: A string, the results of which are the desired
                    conversion.