Store MVC3 authentication data across sessions in iPad web-app mode

Question

I have a MVC3 project for running on the iPad in the web-app mode. I use FormsAuthentication to realize a login/logout functionality which calls FormsAuthentication.SetAuthCookie(model.Username, true) to store the login information into a cookie. In all major browser including the safari mobile the cookie is saved persistend, across sessions. Only in the web-app mode the cookie is sometimes cleared during browsing the web-app and it is definitely deleted after closing the web-app. Is there any possibility to save the login information across session in web-app mode, too?

I know that the HTML5 local storage feature could be used, but I've no idea how to implement FormsAuthentication.SetAuthCookie(model.Username, true) manually by using the new local storage. And besides that, I'm not sure whether the local storage is safe enough to store such critical data.

Answer 1

I found the answer after a lot of research: You have to force the usage of cookies in the authentication node of web.config through cookieless="UseCookies":

<authentication mode="Forms">
   <forms cookieless="UseCookies" loginUrl="~/Account/LogOn" timeout="2880" />
</authentication>