A copy of the configuration object for this session.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 2.0+
Beginning in iOS 9 and OS X 10.11,
URLSession objects store a copy of the
URLSession object passed to their initializers, such that a session’s configuration is immutable after initialization. Any further changes to mutable properties on the configuration object passed to a session’s initializer or the value returned from a session’s configuration property do not affect the behavior of that session. However, you can create a new session with the modified configuration object.