AFDownloadRequestOperation
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A progressive download operation for AFNetworking.
Changing import to allow AFDownloadRequestOperation to be built as a framework.
found if i got wrong url, the failureBlock cannot callback. because of the self.error is set by super.responseObject.
This method was not implemented so caused a compiler error
I'm using `AFDownloadRequestOperation` on my project, but when it receives 416 HTTP status (Requested Range Not Satisfiable), the success block is being called. So I created this fix: every time...