public NSURLAuthenticationChallenge(NSURLProtectionSpace protectionSpace, [Optional] NSURLCredential proposedCredential, int previousFailureCount, [Optional] NSURLResponse failureResponse, [Optional] NSError error, NSURLAuthenticationChallengeSender sender)
 {
 }
 public NSURLAuthenticationChallenge(NSURLAuthenticationChallenge authenticationChallenge, NSURLAuthenticationChallengeSender sender)
 {
 }