NSURLDownload provides an application the ability to download the contents of a URL directly to disk. It is available in OS X v10.2 with Safari 1.0 installed, available in OS X v10.2.7 and later This tag should be used only on questions that are about NSURLDownload. The tags [NSURLDownload] and [NSURLDownloadDelegate] should be used to ask about. Use the related tags [osx] for issues specific to those platforms. It is not available in iOS.
NSURLDownload provides an application the ability to download the contents of a URL directly to disk. It provides an interface similar to NSURLConnection, adding an additional method for specifying the destination of the file. NSURLDownload can also decode commonly used encoding schemes such as MacBinary, BinHex and gzip. Unlike NSURLConnection, data downloaded using NSURLDownload is not stored in the cache system.