Will that simulate the effect of the January 1 cut off?
To be clear, the upcoming change is related to App Review, not to the OS itself. iOS 10 already includes all the upcoming ATS-related changes (modulo some bug fixes that are in the current 10.2 seed). For more context on this, see my App Transport Security pinned post.
At the technical level, the best ATS exception dictionary is the empty ATS exception dictionary. I recommend you remove
NSAppTransportSecurity entirely from your
Info.plist and see what breaks in your app. From there, you can add back in the specific exceptions you need. That will give you some idea as to the scope of the problem.
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"