NSURLConnection (as part of AFNetworking) doesn't call NSURLConnectionDataDelegate delegate?

The library maybe implements a connection:didSendBodyData:totalBytesWritten:totalBytesExpectedToWrite: method in a category on NSObject . That would be very nasty but that could explain why the method of AFURLConnectionOperation is not called.

A third-party error reporting library was overriding that delegate method on NSURLConnection. Removing the library resolved the issue. (There was no issue with either AFNetworking or NSURLConnection.).

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