code: def root(self, request, url):
          
          # Delegate to the appropriate method, based on the URL.
          if url is None:
              return self.main_view(request)
          try:
              plugin_name, rest_of_url = url.split('/', 1)
          except ValueError:  # need more than 1 value to unpack
              plugin_name, rest_of_url = url, None
          try:
              plugin = self.plugins[plugin_name]
          except KeyError:
              raise http.Http404('A plugin with the requested name '
                                 'does not exist.')
          return plugin.model_view(request, self, rest_of_url)
docs: Handles main URL routing for the databrowse app.
  
          `url` is the remainder of the URL -- e.g. 'objects/3'.