Sent when the URL download must authenticate a challenge in order to download the request.
Original signature is '- (void)download:(NSURLDownload *)download didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge'
Available in Mac OS X v10.2 with Safari 1.0 installed and later.

C# | Visual Basic | Visual C++ |
public event NSURLDownload..::..DownloadDidReceiveAuthenticationChallengeEventHandler DownloadDidReceiveAuthenticationChallenge
Public Event DownloadDidReceiveAuthenticationChallenge As NSURLDownload..::..DownloadDidReceiveAuthenticationChallengeEventHandler
public: event NSURLDownload..::..DownloadDidReceiveAuthenticationChallengeEventHandler^ DownloadDidReceiveAuthenticationChallenge { void add (NSURLDownload..::..DownloadDidReceiveAuthenticationChallengeEventHandler^ value); void remove (NSURLDownload..::..DownloadDidReceiveAuthenticationChallengeEventHandler^ value); }

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)