jetty.java

    HTTP2Client client = new HTTP2Client();
    SslContextFactory sslContextFactory = new SslContextFactory(true);
    HTTP2ClientConnectionFactory h2 = new HTTP2ClientConnectionFactory();
    client.setClientConnectionFactory(h2);
    client.addBean(h2);
    client.addBean(sslContextFactory);
    client.start();

    FuturePromise<Session> sessionPromise = new FuturePromise<>();
    client.connect(sslContextFactory, new InetSocketAddress(host, port), new ServerSessionListener.Adapter(), sessionPromise);
    Session session = sessionPromise.get(5, TimeUnit.SECONDS);

    HttpFields requestFields = new HttpFields();
    MetaData.Request metaData = new MetaData.Request("GET", new HttpURI("https://" + host + ":" + port + "/"),
        HttpVersion.HTTP_2, requestFields);
    HeadersFrame headersFrame = new HeadersFrame(metaData, null, true);