code: public function buildResponseForRoute(IRoute $route) {
          $abstract = $route->getAction();
  
          if ($abstract instanceof IHttpResponse) {
              return $abstract;
          } else {
              $response = $abstract;
  
              if ($abstract instanceof Closure) {
                  $response = $abstract(new CurrentRequest(), $route->getParameters());
              }
  
              if ( ! $response instanceof IHttpResponse) {
                  $response = $this->createResponse(HttpStatusCode::OK, $response);
              }
  
              return $response;
          }
      }
docs: @param IRoute $route
  
  @return null|HttpResponse