NSURLSessionDataTask should not log cancellation to debugger console

Number:rdar://36156990 Date Originated:2017-12-20 18:04CET
Status:Open Resolved:
Product:iOS + SDK Product Version:iOS 11 and above
Classification:UI/Usability Reproducible:Always
CFNetwork Framework

When cancelling an `NSURLSessionDataTask`, it typically logs this to the debugger console. It really shouldn’t do that, especially if the session’s delegate implements `-[<NSURLSessionDelegate> URLSession:task:didCompleteWithError:]`.

Steps to Reproduce:
- Build and run any of the schemes in the attached sample project
- make sure you can see the debugger console, and tap on the “Make Request” button

Expected Results:
If you have a working internet connection, and our website isn’t down, you shouldn’t see _anything_ logged to the console.

Actual Results:
For every tap on the button, you a line like the following is logged to the console:

2017-12-20 17:33:26.708636+0100 Task Force Swift[32801:407445] Task <E9222022-EA65-4105-8AD1-863F9ACB2C64>.<7> finished with error - code: -999

iOS 11 and above



Sample App

Can be found under https://github.com/PSPDFKit-labs/radar.apple.com/tree/master/36156990%20-%20NSURLSessionDataTask%20should%20not%20log%20cancellation%20to%20debugger%20console

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