code: public static <I extends Request, O extends Response>
      CompositeServiceEntry<I, O> ofCatchAll(Service<I, O> service) {
          return new CompositeServiceEntry<>(PathMapping.ofCatchAll(), service);
      }
docs: Creates a new {@link CompositeServiceEntry} whose {@link Service} is bound at
  {@linkplain PathMapping#ofCatchAll() the catch-all path mapping}.