Update your apps to use new features, and test your apps against API changes.
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.
Certain top-level domains (TLDs) such as
.appare now in the Foundation
NSURLConnectionHTTP Strict Transport Security (HSTS) preload list. An app which uses
URLSessionto visit a matching URL will always navigate to the URL as
https://, and never as cleartext
http://. See the HTTP Strict Transport Security (HSTS) Specification for more information about HSTS. (56247242)