http://_app url and redirection

Hi all, I'm able to use in the encapsulated app url like http://__app/index.html to reference local page. I need to load a page from a website, and then forward back the use with an HTTP REDIRECT to local resource, I tried to redirect to http://__app/index.html but the encapsulator debugger say me Error -105 when loading url "http://__app/index.html" . How in can bring the user back to local html file? Thanks a lot Michele