For testing purposes, we may want to have local testing servers using self-signed SSL certificate for HTTPS connection. Now, suppose we have a local server with self-signed certificate, establishing an actual HTTPS connection would require us to trust our self-signed certificate. It is easy on a browser: few clicks, and you will be on your way. But how about a Swift application?
Caution: Get an actual, trusted, signed certicate for production apps!
App Transport Security (ATS) is a technology that requires an app to either support best practice HTTPS security or statically declare its security limitations via a property in its
Info.plist.