QDesktopServices URL handlers should match scheme in case insensitive way

I can register a custom handler for http URL using code like this:

QDesktopServices::setUrlHandler("http", this, "openUrl");

After this, opening "http://example.com" will call my handler. However, my handler won't be called when opening "HTTP://EXAMPLE.COM" (in upper case).
I think this is a bit surprising - I'd expect my handler would be called no matter what casing is used.