iOS 9.0 – Use HTTPS Exclusively for App Transport Security

imgresApple is “strongly” suggesting you use HTTPS only going forward with iOS 9 for App Transport Security.

When Apple tends to make something a default (even if they allow exceptions) it usually means it will be required later. Hint: Change.

App Transport Security

App Transport Security (ATS) enforces best practices in the secure connections between an app and its back end. ATS prevents accidental disclosure, provides secure default behavior, and is easy to adopt; it is also on by default in iOS 9 and OS X v10.11. You should adopt ATS as soon as possible, regardless of whether you’re creating a new app or updating an existing one. If you’re developing a new app, you should use HTTPS exclusively. If you have an existing app, you should use HTT

Source: iOS 9.0 – Apple Documentation