code: def serve_doc(app, url):
      
      @app.route(url, doc=False)
      def index(env, req):
          ret = ''
          for d in env['doc']:
              ret += 'URL: {url}, supported methods: {methods}{doc}\n'.format(**d)
          return ret
docs: Serve API documentation extracted from request handler docstrings
  
      Parameters:
          * app: Grole application object
          * url: URL to serve at