Hi,

I am trying to add the authentication logic for the existing code with the 
NSURLDownload, but  download:canAuthenticateAgainstProtectionSpace and 
download:didReceiveAuthenticationChallenge: are not being called with the below 
sample code base.  But Apple Documentation says:

  *   If the request is associated with an NSURLConnection or NSURLDownload 
object, that object’s delegate receives 
aconnection:canAuthenticateAgainstProtectionSpace:<https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSURLConnectionDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/NSURLConnectionDelegate/connection:canAuthenticateAgainstProtectionSpace:>
 (or download:canAuthenticateAgainstProtectionSpace:) message. This allows the 
delegate to analyze properties of the server, including its protocol and 
authentication method, before attempting to authenticate against it. If your 
delegate is not prepared to authenticate against the server’s protection space, 
you can return NO, and the system attempts to authenticate with information 
from the user’s keychain.

I am not getting what I am doing wrong here trying on 10.9.4.  Why delegates 
are not being called?


@interface PGAppDelegate : NSObject <NSApplicationDelegate>

{

    NSURLDownload *mURLDownload;

}


@property (assign) IBOutlet NSWindow *window;


@end


@implementation PGAppDelegate


- (void)applicationDidFinishLaunching:(NSNotification *)aNotification

{

    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL 
URLWithString:@“Some URL with HTTPS – url with image will work"] 
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:120];



    mURLDownload = [[NSURLDownload alloc] initWithRequest:urlRequest 
delegate:self];



    [mURLDownload setDestination:@"/Users/dev/Desktop/imageData" 
allowOverwrite:YES];


}


#pragma mark NSURLDownload delegate methods


- (void)downloadDidBegin:(NSURLDownload *)download

{

    NSLog(@"%s", __FUNCTION__);


}


- (void)download:(NSURLDownload *)download didFailWithError:(NSError *)error

{

    NSLog(@"Download failed! Error - %@ %@",

          [error localizedDescription],

          [error userInfo]);

}


- (void)download:(NSURLDownload *)download 
didReceiveDataOfLength:(NSUInteger)length

{

    NSLog(@"%s length:%d", __FUNCTION__, length);

}


- (void)downloadDidFinish:(NSURLDownload *)download

{

    NSLog(@"%s download: %@", __FUNCTION__, download);

}


- (void)download:(NSURLDownload *)download didReceiveResponse:(NSURLResponse 
*)response

{

    NSLog(@"%s response:%@", __FUNCTION__, response);

}


- (BOOL)download:(NSURLDownload *)connection 
canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace

{

    NSLog(@"%s protectionSpace:%@", __FUNCTION__, protectionSpace);

return YES;

}


- (void)download:(NSURLDownload *)download 
didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge

{

    NSLog(@"%s challenge:%@", __FUNCTION__, challenge);

}


@end

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