Error uploading file to Amazon S3 - ios

Question

I want t upload a csv file from my iOS App (written in Swift) to my amazon S3 bucket. To do this I'm using following code:
//Create
let fileName = "Export.csv"
let path = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(fileName)
csvText = CreateCSVAccount()
do {
try csvText.write(to: path!, atomically: true, encoding: String.Encoding.utf32BigEndian)
//Prepare Upload
let uploadingFileURL = path
let uploadRequest = AWSS3TransferManagerUploadRequest()
let Bucketname = "mybucket/CSV"
uploadRequest?.bucket = Bucketname
uploadRequest?.key = "mycsvfile.csv"
uploadRequest?.body = uploadingFileURL!
//Upload File
transferManager.upload(uploadRequest!).continueWith(executor: AWSExecutor.mainThread(), block: { (task:AWSTask<AnyObject>) -> Any? in
if let error = task.error as NSError? {
if error.domain == AWSS3TransferManagerErrorDomain, let code = AWSS3TransferManagerErrorType(rawValue: error.code) {
switch code {
case .cancelled, .paused:
break
default:
print("Error Contact uploading: \(String(describing: uploadRequest?.key)) Error: \(error)")
}
} else {
print("Error Contact uploading: \(String(describing: uploadRequest?.key)) Error: \(error)")
}
return nil
}
let uploadOutput = task.result
print("Upload complete for: \(String(describing: uploadRequest?.key))")
print("uploadOutput: \(String(describing: uploadOutput))")
return nil
})
} catch {
print("Failed to create file")
print("\(error)")
}
The problem is sometimes it works and sometimes I'm receiving the following error:
Message=You did not provide the number of bytes specified by the Content-Length HTTP header, NumberBytesExpected=412, Code=IncompleteBody, RequestId=075D1F5B0A377E89
Can somebody please help me?
Thank you very much in advance!

Answer 1

Add the contentLength header to your request.
That is:
uploadRequest?.contentLength = 1234
where 1234 is an NSNumber representing the number of bytes in body