QNetworkAccessManager is ignored for HTML5 <audio> resources?

Hi there,
I've been using QNetworkAccessManager/QNetworkReply to load in-memory images into QWebPage, and it is working fine. But cannot do the same for <audio> HTML5 tags. Seems QWebPage just ignores QNetworkAccessManager when loading audio resources (i.e. QNetworkAccessManager::createRequest is not getting called) ...
Anybody has any clues as to why it doesn't work?

Thanks!

Did you ever figure anything out with this? I'm still at a loss.