code: @Override
  	public WebsocketFinalizer send(Function<? super HttpClientRequest, ? extends Publisher<Void>> sender) {
  		Objects.requireNonNull(sender, "requestBody");
  		return new WebsocketFinalizer(cachedConfiguration.bootstrap(b -> HttpClientConfiguration.body(b, (req, out) -> sender.apply(req))));
  	}
docs: WebsocketSender methods