code: def setup(self, **kwargs):
          
  
          for key in kwargs:
              if key not in self.config.keys():
                  raise error.GrabMisuseError('Unknown option: %s' % key)
  
          if 'url' in kwargs:
              if self.config.get('url'):
                  kwargs['url'] = self.make_url_absolute(kwargs['url'])
          self.config.update(kwargs)
docs: Setting up Grab instance configuration.