# CFHTTPAuthenticationCopyRealm(_:) Gets an authentication information’s namespace. ``` func CFHTTPAuthenticationCopyRealm(_ auth: CFHTTPAuthentication) -> Unmanaged ``` ## Parameters `auth` The CFHTTPAuthentication object to examine. ## Return Value The namespace, if there is one; otherwise `NULL`. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029). ## Discussion Some authentication methods provide a namespace, and it is usually used to prompt the user for a name and password. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)