public static void main(final String[] args) throws Exception {
        try (final CloseableHttpAsyncClient client = HttpAsyncClients.createSystem()) {

            client.start();

            final HttpHost target = new HttpHost("https", "www.google.com");
            final SimpleHttpRequest request = SimpleRequestBuilder.get()
                    .setUri("https://www.google.ch/")
                    .build();

            final HttpClientContext clientContext = HttpClientContext.create();

            System.out.println("Executing request " + request);
            final Future<SimpleHttpResponse> future = client.execute(
                    target,
                    SimpleRequestProducer.create(request),
                    SimpleResponseConsumer.create(),
                    null,
                    clientContext,
                    new FutureCallback<SimpleHttpResponse>() {

                        @Override
                        public void completed(final SimpleHttpResponse response) {
                            System.out.println(request + "->" + new StatusLine(response));
                            final SSLSession sslSession = clientContext.getSSLSession();
                            if (sslSession != null) {
                                try {
                                    System.out.println("Peer: " + sslSession.getPeerPrincipal());
                                    System.out.println("TLS protocol: " + sslSession.getProtocol());
                                    System.out.println("TLS cipher suite: " + sslSession.getCipherSuite());
                                } catch (final SSLPeerUnverifiedException ignore) {
                                }
                            }
                        }

                        @Override
                        public void failed(final Exception ex) {
                            System.out.println(request + "->" + ex);
                        }

                        @Override
                        public void cancelled() {
                            System.out.println(request + " cancelled");
                        }

                    });
            future.get();

            System.out.println("Shutting down");
            client.close(CloseMode.GRACEFUL);
        }
    }
This example demonstrates how to use SNI to send requests to a virtual HTTPS
endpoint using the async I/O.
httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientSNI.java