setTaskDidReceiveAuthenticationChallengeBlock in AFNetworking 2.0

Question

Anybody know how to handle authentication in the 2.0 version of AFNetworking? I tried the below without success. The block is getting called (I had an NSLog in there) but the response is still a 401 error

[self setTaskDidReceiveAuthenticationChallengeBlock:^NSURLSessionAuthChallengeDisposition(NSURLSession *session, NSURLSessionTask *task, NSURLAuthenticationChallenge *challenge, NSURLCredential *__autoreleasing *credential) {
    *credential = [[NSURLCredential alloc] initWithUser:username password:password persistence:NSURLCredentialPersistenceForSession];
    return NSURLSessionAuthChallengeUseCredential;
}];

Answer 1

I think this is a bug in AFNetworking 2.0. Here is the implementation:

- (void)URLSession:(NSURLSession *)session
              task:(NSURLSessionTask *)task
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
 completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler
{
    NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
    __block NSURLCredential *credential = nil;

    if (self.taskDidReceiveAuthenticationChallenge) {
        disposition = self.taskDidReceiveAuthenticationChallenge(session, task, challenge, &credential);
    } else {
        [self URLSession:session didReceiveChallenge:challenge completionHandler:completionHandler];
        return;
    }

    if (completionHandler) {
        completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, credential);
    }
}

Note that even though you're specifying NSURLSessionAuthChallengeUseCredential, AFNetworking is passing back NSURLSessionAuthChallengePerformDefaultHandling, which states "Default handling for the challenge - as if this delegate were not implemented; the credential parameter is ignored."