private static HttpProcessor createMinimalProtocolProcessor() {
        return new DefaultHttpProcessor(
                new H2RequestTargetHost(),
                new H2RequestContent(),
                new H2RequestConnControl(),
                new RequestUserAgent(VersionInfo.getSoftwareInfo(
                        "Apache-HttpAsyncClient", "org.apache.hc.client5", HttpAsyncClients.class)));
    }
Creates HTTP/2 {@link CloseableHttpAsyncClient} instance with default configuration and
system properties optimized for HTTP/2 protocol and message multiplexing.
httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncClients.java