App Transport Security：RESTful API的哪种方法？ `NSExceptionAllowsInsecureHTTPLoads`或`NSAllowsArbitraryLoads`

I upgraded to Xcode 7.0.1 where the project targets iOS 9. If I would like to permit RESTful APIs with HTTP, should I use I upgraded to Xcode 7.0.1 where the project tar