@Override
                    public void completed(final SimpleHttpResponse response) {
                        System.out.println(warmup + "->" + new StatusLine(response));
                        System.out.println(response.getBody());
                    }
Example of asynchronous HTTP/1.1 request execution with message exchange multiplexing
over HTTP/2 connections.
httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientH2Multiplexing.java