Learn how to use URLSession, Apple's networking API, including when and how to use data, download and upload tasks, with or without a custom session delegate, and how the system manages background sessions. Keep your users' data safe with authentication and App Transport Security, and pick up tips for networking architecture, testing and metrics. Updated for iOS 11 and Swift 4.
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/4321-networking-with-urlsession