code: def url(self, pattern, method=None, name=None):
          
          def _inner(call):
              self._url_manager.add(pattern, method, call, name)
              return call
          return _inner
docs: Decorator to map url pattern to the callable.
  
          Args:
              pattern (:obj:`str`): URL pattern to add. This is usually '/'
                  separated path. Parts of the URL can be parameterised using
                  curly braces.
                  Examples: "/", "/path/to/resource", "/resoures/{param}"
              method (:obj:`str`, :obj:`list` of :obj:`str`, optional): HTTP
                  methods for the path specied. By default, GET method is added.
                  Value can be either a single method, by passing a string, or
                  multiple methods, by passing a list of strings.
              name (:obj:`str`): Name for the pattern that can be used for
                  reverse matching
  
          Note:
              A trailing '/' is always assumed in the pattern.
  
          Example:
              >>> @app.url(pattern='/path/to/resource', method='GET')
              >>> def function(ctx):
              >>>     return 'Hello world'
  
          See Also:
              :func:`drongo.managers.url.UrlManager.add`