AmazonServiceException: A WebException with status RequestCanceled was thrown.

Question

Hello community, I have a question regarding an exception that we are getting often and it is causing some extra computation from our side due to the retries that we have to do in order to process a job.
During the execution of the job when we try to download some data from S3 using the S3 client we might get the following error: Inner WebException: The request was aborted: The request was canceled. from System
	   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
   at async Amazon.Runtime.Internal.HttpRequest.GetResponseAsync(?)
   at async Amazon.Runtime.Internal.HttpHandler`1.InvokeAsync[](?)
   at async Amazon.Runtime.Internal.RedirectHandler.InvokeAsync[](?)
   at async Amazon.Runtime.Internal.Unmarshaller.InvokeAsync[](?)
   at async Amazon.S3.Internal.AmazonS3ResponseHandler.InvokeAsync[](?)
   at async Amazon.Runtime.Internal.ErrorHandler.InvokeAsync[](?)
This is forcing us to fail the job and retry. 
I would like to mention that before opening this question we have updated our package from : 3.7.202.3 to 3.7.300.1 and the error is still present.

All operations are async before calling the S3 client.

Answer

Hi,

Greetings for the day!

Please note that the error "WebException: The request was aborted: The request was canceled" might be because of below reasons:
   
```
    Timeout (100 sec by default)
    Executing async method and not awaiting it
    Executing async void method
    Running job in different task/thread and not waiting it to complete

```
Please refer the below third party articles:
[+] https://stackoverflow.com/questions/52647818/a-task-was-canceled-exception-when-trying-to-upload-file-to-s3-bucket
[+] https://stackoverflow.com/questions/55786738/task-was-cancelled-exception-when-uploading-file-to-s3-bucket-using-aws-net-sdk
[+] https://stackoverflow.com/questions/13903150/transferring-large-files-to-amazon-s3-using-c-sharp-request-aborted-and-cancel
[+] https://stackoverflow.com/questions/21548604/the-request-was-aborted-the-request-was-canceled-no-solution-works

NOTE : Kindly note that the documents shared here are third party documentation not endorsed by AWS.

If you have any further queries, please feel free to reach out to AWS Support along with your specific error and details, and we would be happy to assist you further.

[+] Creating support cases and case management - https://docs.aws.amazon.com/awssupport/latest/user/case-management.html

AmazonServiceException: A WebException with status RequestCanceled was thrown.

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