macOS Catalina 10.15.2 Release Notes
Update your apps to use new features, and test your apps against API changes.
Overview
The macOS 10.15.2 SDK provides support for developing apps for Macs running macOS Catalina 10.15.2. The SDK comes bundled with Xcode 11.3 available from the Mac App Store. For information on the compatibility requirements for Xcode 11.3, see Xcode 11.3 Release Notes.
Networking
New Features
Certain top-level domains (TLDs) such as
.devand.appare now in the Foundation URLSession and NSURLConnection HTTP Strict Transport Security (HSTS) preload list. An app which uses URLSession to visit a matching URL will always navigate to the URL ashttps://, and never as cleartexthttp://. See the HTTP Strict Transport Security (HSTS) Specification for more information about HSTS. (56247242)