Instance Method

URLSession:didReceiveChallenge:completionHandler:

Requests credentials from the delegate in response to a session-level authentication request from the remote server.

Declaration

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler;

Parameters

session

The session containing the task that requested authentication.

challenge

An object that contains the request for authentication.

completionHandler

A handler that your delegate method must call. This completion handler takes the following parameters::

  • disposition—One of several constants that describes how the challenge should be handled.

  • credential—The credential that should be used for authentication if disposition is NSURLSessionAuthChallengeUseCredential, otherwise NULL.

Discussion

This method is called in two situations:

  • When a remote server asks for client certificates or Windows NT LAN Manager (NTLM) authentication, to allow your app to provide appropriate credentials

  • When a session first establishes a connection to a remote server that uses SSL or TLS, to allow your app to verify the server’s certificate chain

If you do not implement this method, the session calls its delegate’s URLSession:task:didReceiveChallenge:completionHandler: method instead.

See Also

Handling Authentication Challenges

NSURLSessionAuthChallengeDisposition

Constants passed by session or task delegates to the provided continuation block in response to an authentication challenge.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software