# CFHTTPAuthenticationIsValid(_:_:) Returns a Boolean value that indicates whether a CFHTTPAuthentication object is valid. ``` func CFHTTPAuthenticationIsValid(_ auth: CFHTTPAuthentication, _ error: UnsafeMutablePointer?) -> Bool ``` ## Parameters `auth` The CFHTTPAuthentication object to examine. `error` Pointer to a structure, whose fields, if an error has occurred, are set to the error and the error’s domain. ## Return Value `TRUE` if `auth` contains enough information to be applied to a request. ## Discussion If this function returns `FALSE`, the CFHTTPAuthentication object may still contain useful information, such as the name of an unsupported authentication method. ## Discussion If this function returns `TRUE` for `auth`, the object is good for use with functions such as [`CFHTTPMessageApplyCredentials(_:_:_:_:_:)`](/documentation/CFNetwork/CFHTTPMessageApplyCredentials(_:_:_:_:_:)) and [`CFHTTPMessageApplyCredentialDictionary(_:_:_:_:)`](/documentation/CFNetwork/CFHTTPMessageApplyCredentialDictionary(_:_:_:_:)). If this function returns `FALSE`, `auth` is invalid, and authentications using it will not succeed. --- 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)