code: private RouteImpl createRouteImpl(String path, String acceptType, Route route) {
          if (defaultResponseTransformer != null) {
              return ResponseTransformerRouteImpl.create(path, acceptType, route, defaultResponseTransformer);
          }
          return RouteImpl.create(path, acceptType, route);
      }
docs: Create route implementation or use default response transformer
  
  @param path       the path
  @param acceptType the accept type
  @param route      the route
  @return ResponseTransformerRouteImpl or RouteImpl