public Response execute(final CloseableHttpClient client) throws IOException {
        return new Response(internalExecute(client, HttpClientContext.create()));
    }
Execute the request using an HTTP/2 capable engine. The exact protocol version
will still have to be negotiated by individual connections.
<p>
This feature is considered experimental and may be discontinued in the future.

@since 5.5
httpclient5-fluent/src/main/java/org/apache/hc/client5/http/fluent/Request.java