The completion handler block that's invoked after the request has finished processing.
- iOS 11.0+
- macOS 10.13+
- UIKit for Mac 13.0+Beta
- tvOS 11.0+
The completion handler is executed on the same dispatch queue as the request being executed.
Configuring a Request
var revision: Int
The specific algorithm or implementation revision that is to be used to perform the request.
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