I'm using the html 5 cache to go offline with my Sencha Touch app.
Sencha mostly works fine - but I have found that The AjaxProxy fails reading cached json files when the server is offline even though these are specified in the cache.manfiest.
I know the HTML5 cache works with the ajax calls made with the standard XMLHttp object - but the http response codes in the callbacks are a bit dodgy.

Is there a work around for this? - is this a bug?
Any help or advice would be greatly appreciated.