# CFHTTPMessageApplyCredentials(_:_:_:_:_:) Performs the authentication method specified by a `CFHTTPAuthentication` object. ``` func CFHTTPMessageApplyCredentials(_ request: CFHTTPMessage, _ auth: CFHTTPAuthentication, _ username: CFString?, _ password: CFString?, _ error: UnsafeMutablePointer?) -> Bool ``` ## Parameters `request` Request for which the authentication method is to be performed. `auth` A `CFHTTPAuthentication` object specifying the authentication method to perform. `username` Username for performing the authentication. `password` Password for performing the authentication. `error` If an error occurs, upon return contains a object that describes the error and the error’s domain. Pass `NULL` if you don’t want to receive error information. ## Return Value `TRUE` if the authentication was successful, otherwise, `FALSE`. ## Discussion This function performs the authentication method specified by `auth` on behalf of the request specified by `request` using the credentials specified by `username` and `password`. If, in addition to a username and password, you also need to specify an account domain, call [`CFHTTPMessageApplyCredentialDictionary(_:_:_:_:)`](/documentation/CFNetwork/CFHTTPMessageApplyCredentialDictionary(_:_:_:_:)) instead of this function. This function is appropriate for performing several authentication requests. If you only need to make a single authentication request, consider using [`CFHTTPMessageAddAuthentication(_:_:_:_:_:_:)`](/documentation/CFNetwork/CFHTTPMessageAddAuthentication(_:_:_:_:_:_:)) instead. ### Special Considerations This function is thread safe as long as another thread does not alter the same `CFHTTPMessage` object at the same time. --- 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)