How do I do an Asynchronous NSURLConnection inside an NSOperation?

I want to do an Asynchrous NSURLConnection inside of an NSOperation on a background thread. (it is because I'm doing some very expensive operations on the data as they come back that want to be done as the data comes in and in background) Here is my first attempt: IN my AppDelegate: // create the opperation and add it to the queue: self.sharedOperationQueue = [[[NSOperationQueue alloc] init] autor