Gets the strongest authentication method that will be used when a CFHTTPAuthentication object is applied to a request.
- iOS 2.0+
- macOS 10.2+
- Mac Catalyst 13.0+
- tvOS 9.0+
The CFHTTPAuthentication object to examine.
A string containing the authentication method that will be used
auth is applied to a request. If more than one authentication method is available, the strongest authentication method is returned. Ownership follows the The Create Rule.