If user force terminated app, suspended AWSS3TransferUtilityDownloadTask has error status

[SanCHEESE]

Describe the bug When AWSS3TransferUtility handles NSURLSession's NSURLSessionTask after app start (after force close), it handles such error without resuming download:

Error Domain=NSURLErrorDomain Code=-999 "(null)" UserInfo={NSURLErrorBackgroundTaskCancelledReasonKey=0, NSErrorFailingURLStringKey=https://s3.eu-central-1.amazonaws.com/..., NSURLSessionDownloadTaskResumeData=<3c3f786d ...>}

Code -999 means that task was cancelled, NSURLErrorBackgroundTaskCancelledReasonKey=0 means that user terminated an app manually. There is NSURLSessionDownloadTaskResumeData value which has resume data to continue the download.

To Reproduce Steps to reproduce the behavior:

1. Start a download using AWSS3TransferUtility.
2. Force terminate an App, when handling UIApplicationWillTerminateNotification, suspend ongoing download.
3. When app didFinishLaunchingWithOptions: register utility with the same key as before
4. Scan utility's getDownloadTasks.result in completionHandler of +(void)registerS3TransferUtilityWithConfiguration...
5. There is the task with the error above.

Which AWS service(s) are affected? S3

Expected behavior What I expect is that AWSS3TransferIUtility's getDownloadTasks.result will return AWSS3TransferUtilityDownloadTask task with paused status and upon resume, it continues from where it was suspended.

Environment(please complete the following information):

• SDK Version: 2.6.32
• Dependency Manager: Cocoapods
• Swift Version : Objective-C

Device Information (please complete the following information):

• Device: iPod touch
• iOS Version: 11.4.1
• Specific to simulators: no

Additional context BTW, using resume data above you can resume download process by invoking

(NSURLSessionDownloadTask *)downloadTaskWithResumeData:(NSData*)resumeData

[SanCHEESE]

This one was created with @cbommas blessing - https://github.com/aws/aws-sdk-ios/issues/1047#issuecomment-430369830

[scb01]

@SanCHEESE I am marking this as a feature request and will post back here once I have a timeline that I can share.

[boek]

any updates? 😻

[AlexGingell]

Bump for updates :)

[atierian]

Thanks for opening this feature request. We don't plan on adding support for this feature at this time.