# CFHTTPMessageApplyCredentialDictionary(_:_:_:_:) Use a dictionary containing authentication credentials to perform the authentication method specified by a `CFHTTPAuthentication` object. ``` func CFHTTPMessageApplyCredentialDictionary(_ request: CFHTTPMessage, _ auth: CFHTTPAuthentication, _ dict: CFDictionary, _ error: UnsafeMutablePointer?) -> Bool ``` ## Parameters `request` The request for which the authentication method is to be performed. `auth` A `CFHTTPAuthentication` object specifying the authentication method to perform. `dict` A dictionary containing authentication credentials to be applied to the request. For information on the keys in this dictionary, see [`CFHTTPAuthentication`](/documentation/CFNetwork/CFHTTPAuthentication). `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 contained in the dictionary specified by `dict`. The dictionary must contain values for the `kCFHTTPAuthenticationUsername` and `kCFHTTPAuthenticationPassword` keys. If [`CFHTTPAuthenticationRequiresAccountDomain(_:)`](/documentation/CFNetwork/CFHTTPAuthenticationRequiresAccountDomain(_:)) returns `TRUE` for `auth`, the dictionary must also contain a value for the `kCFHTTPAuthenticationAccountDomain` key. ### Special Considerations This function is thread safe as long as another thread does not alter the same `CFHTTPAuthentication` 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)