Open Radar

 
Summary:
NSURLSession seems to ignore the configuration parameter that you pass in the initializer, and what's worse: it looks like it returns a different configuration every time you query that property, making using  NSURLSessionConfiguration impossible.

You can find attached a playground showing what's happening. Open it with Xcode 6 and with Xcode 7 to see the difference

Steps to Reproduce:
1.- Store in a property NSURLSessionConfiguration.defaultSessionConfiguration()

2.- Pass that into the initializer of NSURLSession

3.- Query the property 'configuration' of the created NSURLSession

4.- Query it again, and again... Notice that it always changes

Expected Results:
The returned NSURLSessionConfiguration is consistent with what was passed in the initalizer

Actual Results:
The returned NSURLSessionConfiguration is changing every time the property is queried.

Version:
iOS 9 beta 5 (build 13A4325c)

Notes:
This is of vital importance to fix, since the use of NSURLSessionConfiguration is key to a lot of our core technologies.

Configuration:
iPhone Simulator and iPod Touch