If ATS is enabled, UIWebView can't access to https://www.apple.com/ .
description = Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made."
Is this correct behavior ?
Someone else noticed the same thing and opened a radar (21337673),
See: https://forums.developer.apple.com/message/11677#11677
But iOS 9 and OSX 10.11 require TLSv1.2 SSL for all hosts you plan to request data from. If it's 1.1 or lower, you need to specify exception domains in your app's Info.plist file.
For futher info on how to do that:
https://forums.developer.apple.com/message/7383#7383