code: def get_target_delegate(
          self, target: Any, request: httputil.HTTPServerRequest, **target_params: Any
      ) -> Optional[httputil.HTTPMessageDelegate]:
          
          if isinstance(target, Router):
              return target.find_handler(request, **target_params)
  
          elif isinstance(target, httputil.HTTPServerConnectionDelegate):
              assert request.connection is not None
              return target.start_request(request.server_connection, request.connection)
  
          elif callable(target):
              assert request.connection is not None
              return _CallableAdapter(
                  partial(target, **target_params), request.connection
              )
  
          return None
docs: Returns an instance of `~.httputil.HTTPMessageDelegate` for a
          Rule's target. This method is called by `~.find_handler` and can be
          extended to provide additional target types.
  
          :arg target: a Rule's target.
          :arg httputil.HTTPServerRequest request: current request.
          :arg target_params: additional parameters that can be useful
              for `~.httputil.HTTPMessageDelegate` creation.