Retry on closed connection

[eminugurkenar]

We upload large amount of data to s3 and after upgrading version 1.0.0 , we experienced failures for large uploads , randomly we get errors like below.

RequestError: send request failed caused by: Put "https://testing.s3.amazonaws.com/xxxxx&partNumber=n&uploadId=id": write tcp 10.xx.xx.xx:41654->52.216.8.115:443: use of closed network connection

After digging AWS SDK ShouldRetry method, we noticed that for some cases it does return false but for some cases it returns true even if base error says use of closed network connection in both cases, you can see below

SerializationError: failed to unmarshal error message status code: 500, request id: IDDDDDDD, host id: 3231sdsadasdasdI= caused by: UnmarshalError: failed to unmarshal error message caused by: read tcp 10.xx.xx.xx:39860->52.216.166.67:443: use of closed network connection: true

RequestError: send request failed caused by: Put "https://testing.s3.amazonaws.com/xxxx?partNumber=n&uploadId=id--": write tcp 10.xx.xx.xx:41654->52.216.8.115:443: use of closed network connection: false

So we implemented this patch to retry on any error that contains use of closed network connection , as golang does not export this error https://github.com/golang/go/issues/4373 , we had to check error msg.

[igungor]

could you update S3Retry test?