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I have a rails 3.0.3 website that, in development mode, responds to a HTTP GET by calling didReceiveData and then connectionDidFinishLoading, and photo data is sent from the website to the iPhone and displayed correctly. But when I run the rails 3.0.3 website in production mode, connectionDidFinishLoading is called before didReceiveData. I'm using carrierwave to handle the photos for both the development and production rails sites. Does anyone have any idea what could cause connectionDidFinishLoading to get called before didReceiveData? I've tried checking the following: 1) I made sure the NSURLConnectionDelegate is called for the class' interface. 2) didReceiveResponse gets called before connectionDidFinishLoading and the statusCode = 200. 3) In the rails app I am using send_file to send the photo data, and the path to the file sent in production, is an actual photo. 4) I checked that data was being returned from the production website by using the code below