Sample HttpClient.sendAsync() Method Usage

//Create an instance of HttpClient using its builder.
HttpClient httpClient = HttpClient.newBuilder()
        .version(HttpClient.Version.HTTP_2)
        .build();

//Create an instance of HttpRequest using its builder.
HttpRequest req = HttpRequest.newBuilder(URI.create("https://www.google.com"))
            .GET()
            .build();

/* Use the httpClient.sendAsync() method and encapsulate the response
in the CompletableFuture. */
CompletableFuture<HttpResponse> resFuture =
        httpClient.sendAsync(req, HttpResponse.BodyHandlers.ofString());

//Use the resFuture.thenAccept to wait for the async response.
resFuture.thenAccept(res -> System.out.println(res.version()));

//Wait for the resFuture to to complete.
resFuture.join();