HTML5 AppCache in UIWebView

I would like to use appcache in my native iPhone application. Although Mobile Safari supports appcache, it seems that the UIWebView that you can embed in the application does not work.

I know with a little work, I could mimic some appcache application as functionality in my application, but this is not good enough - I would like to access the same cache that Mobile Safari uses.

I would like to use some of the private frameworks in the iPhone SDK, since getting this work is a much higher priority than being able to send to the application store.

Thank!