HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(NOTIFICATION_URL))
                .header("Content-Type", "application/json")
                .POST(ofString(mapper.writeValueAsString(notification)))
                .build();
        client.sendAsync(request, ofString())
                .thenApply(HttpResponse::body)
                .thenAccept(System.out::println)
                .join();