QCoreApplication app(argc, argv);
    QNetworkRequest request;
    QUrl url;
    url.setAuthority("localhost:50051", QUrl::StrictMode);
    url.setScheme("http");
    url.setPath("/Greeter/SayHello");
    request.setUrl(url);
    request.setRawHeader("content-type", "application/grpc");
    request.setRawHeader("grpc-accept-encoding", "identity,deflate,gzip");
    request.setRawHeader("accept-encoding", "identity,gzip");
    request.setAttribute(QNetworkRequest::Http2DirectAttribute, true);
    QNetworkAccessManager nm;
    QNetworkReply *reply = nm.post(request, QByteArray(""));
    QObject::connect(reply, &QNetworkReply::finished, [reply](){
        qDebug() << "reply" << reply->readAll() << reply->errorString();
    });
    return app.exec();