original_string: private function makeNotFoundResponse(Request $request): Promise {
          return $this->errorHandler->handleError(Status::NOT_FOUND, null, $request);
      }
code: private function makeNotFoundResponse(Request $request): Promise {
          return $this->errorHandler->handleError(Status::NOT_FOUND, null, $request);
      }
code_tokens: private function makeNotFoundResponse ( Request $ request ) : Promise { return $ this -> errorHandler -> handleError ( Status :: NOT_FOUND , null , $ request ) ; }
docstring: Create a response if no routes matched and no fallback has been set.
  
  @param Request $request
  
  @return Promise<\Amp\Http\Server\Response>
docstring_tokens: Create a response if no routes matched and no fallback has been set .