asynchronous requests with NSURLConnection: when to release

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Apple guide is very specific about releasing connection object: it's done in didFailWithError and connectionDidFinishLoading. Yet, when I do the same, I later get this in zombi-mode *** -[NSURLConnection releaseDelegate]: message sent to deallocated instance 0x1001045b0 It seems, there's some code in AppKit which releases connection for me. I'd be happy to assume that Apple guide is wrong, but do not want to get some terrible memory leak or introduce some subtle incompatibility with older OSX versions or something like that. Is it safe to ignore documentation in this case? edit Code creating request   URLConnectionDelegate *delegate = [[URLConnectionDelegate alloc] initWithSuccessHandler:^(NSData *response) {       ...   }];   [NSURLConnection connectionWithRequest:request delegate:delegate];    // I do not release delegate when testing for this issue, not sure whether I should in general Delegate class itself - (void)connectionDidFinishLoading:(NSURLConnection *)connection {   successHandler(receivedData);   [receivedData release];   Block_release(successHandler);  // do we really need this????????   [connection release]; } objective-c cocoa nsurlconnection link|edit edited Feb 6 at 2:51 asked Feb 6 at 1:24 Nikita Rybak 24.7k32762 78% accept rate

From the docs: ‘NSURLConnection retains its delegate when it is initialized. It releases the delegate when the connection finishes loading, fails, or is canceled.’ It looks like you have over-released the delegate. – Bavarious Feb 6 at 2:29 @Bavarious I don't release delegate here. (whether I should is another question) Error appears when I add [connection release]; and goes away when I remove it. – Nikita Rybak Feb 6 at 2:32 @Bavarious Also, error wording suggests that method releaseDelegate was invoked on released NSURLConnection instance. Not on delegate. – Nikita Rybak Feb 6 at 2:33 Which object is the URL connection delegate? What is its lifecycle? – Bavarious Feb 6 at 2:36 Hmm, maybe. I’m not familiar with zombies. Would you be willing to paste the code that creates the connection and handles its delegate methods? – Bavarious Feb 6 at 2:39 show 4 more comments Was this post useful to you?