https://developer.apple.com/documentation/foundation/urlsession/datatask(with:completionhandler:)-e6xv
dataTask(with:completionHandler:) | Apple Developer Documentation
Creates a task that retrieves the contents of a URL based on the specified URL request object, and calls a handler upon completion.
apple developerdocumentation
https://developer.apple.com/documentation/foundation/urlsession/downloadtask(with:completionhandler:)-4a84s?language=objc
downloadTask(with:completionHandler:) | Apple Developer Documentation
Creates a download task that retrieves the contents of a URL based on the specified URL request object, saves the results to a file, and calls a handler upon...
apple developerdocumentation
https://developer.apple.com/documentation/foundation/urlsession/uploadtask(with:from:completionhandler:)?language=objc
uploadTask(with:from:completionHandler:) | Apple Developer Documentation
Creates a task that performs an HTTP request for the specified URL request object, uploads the provided data, and calls a handler upon completion.
apple developerdocumentation
https://developer.apple.com/documentation/foundation/urlsessiontaskdelegate/urlsession(_:task:didreceive:completionhandler:)?language=objc
urlSession(_:task:didReceive:completionHandler:) | Apple Developer Documentation
Requests credentials from the delegate in response to an authentication request from the remote server.
apple developertaskdocumentation
https://developer.apple.com/documentation/apptrackingtransparency/attrackingmanager/requesttrackingauthorization(completionhandler:)
requestTrackingAuthorization(completionHandler:) | Apple Developer Documentation
The request for user authorization to access app-related data.
apple developerdocumentation
https://developer.apple.com/documentation/foundation/urlsessiondatadelegate/urlsession(_:datatask:willcacheresponse:completionhandler:)
urlSession(_:dataTask:willCacheResponse:completionHandler:) | Apple Developer Documentation
Asks the delegate whether the data (or upload) task should store the response in the cache.
apple developerdocumentation
https://www.dre.vanderbilt.edu/Doxygen/6.0.1/html/libdance-doc/a00043.html
DAnCE: DAnCE::CompletionHandler PROCESSOR Class Template Reference
danceprocessorclasstemplatereference