code: public static <I extends Request, O extends Response>
      CompositeServiceEntry<I, O> ofPrefix(String pathPrefix, Service<I, O> service) {
          return new CompositeServiceEntry<>(PathMapping.ofPrefix(pathPrefix), service);
      }
docs: Creates a new {@link CompositeServiceEntry} whose {@link Service} is bound under the specified
  directory.
  
  @see PathMapping#ofPrefix(String)