code: def root(self, request, url):
          
          self.root_url = request.path[:len(request.path) - len(url)]
          url = url.rstrip('/')  # Trim trailing slash, if it exists.
  
          if url == '':
              return self.index(request)
          elif '/' in url:
              return self.model_page(request, *url.split('/', 2))
  
          raise http.Http404('The requested databrowse page does not exist.')
docs: Handles main URL routing for the databrowse app.
  
          `url` is the remainder of the URL -- e.g. 'comments/comment/'.