webengine访问的网页内容如何做磁盘缓存,缓存到本地

webkit通过如下代码可以缓存到磁盘
QNetworkDiskCache *diskCache=new QNetworkDiskCache(this);
QString location=QCoreApplication::applicationDirPath();
diskCache->setCacheDirectory(location+"/ceche");
WebView->page()->networkAccessManager()->setCache(diskCache);
webengine应该如何缓存呢，webengine没有networkAccessManager()
求大神告知。

https://www.jianshu.com/p/fff9e5c46b9e