iPhone Cookie Persistence

In my iPhone app, every time I 开发者_如何学编程relaunch my cookies are cleared. This is using the NSURLRequesst and NSHTTPCookieStorage. And no, they are not session only cookies.

How can I get NSHTTPCookieStorage to keep my cookies around, and if I can't, what is the proper way to store them (preference, keychain, etc.).

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