如何从Qt QWebEngineView获取HTTP状态码？

#include <QApplication>
#include <QWebEngineView>
#include <QWebEnginePage>
#include <QNetworkAccessManager>
#include <QNetworkReply>

class WebView : public QWebEngineView
{
    Q_OBJECT
public:
    WebView(QWidget *parent = nullptr) : QWebEngineView(parent)
    {
        connect(this, &QWebEngineView::loadFinished, this, &WebView::onLoadFinished);
    }

private slots:
    void onLoadFinished(bool ok)
    {
        if (ok) {
            QWebEnginePage *page = this->page();
            QNetworkAccessManager *manager = page->networkAccessManager();
            QNetworkReply *reply = manager->currentReply();
            if (reply) {
                QVariant statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
                qDebug() << "HTTP Status Code:" << statusCode.toInt();
            }
        }
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    WebView webView;
    webView.load(QUrl("https://www.example.com"));
    webView.show();

    return a.exec();
}

#include "main.moc"