My gwt / gae application utilizes activities and places. In order to create asynchronous processes (such as resetting a password or verifying ownership of an email address)
Just serve a redirect page (200) that refreshes the window.location upon load and injects the hash fragment.
That way, it works with every browser (at least browsers that support javascript). {{redirectUri}} is the URL you want to redirect to. If it contains a fragment already, it won't be overwritten.