code: @Deprecated
      public final U setDecorator(
              Function<Service<HttpRequest, HttpResponse>,
                      ? extends Service<HttpRequest, HttpResponse>> decorator) {
          return setDecorators(requireNonNull(decorator, "decorator"));
      }
docs: Sets the decorator of the annotated service object. {@code decorator} are applied to {@code service} in
  order.
  @deprecated Use {@link #setDecorators(Function[])} or {@link #setDecorators(List)} instead.