countOfBytesSent
The number of bytes that the task has sent to the server in the request body.
Declaration
var countOfBytesSent: Int64 { get }Discussion
This byte count includes only the length of the request body itself, not the request headers.
To be notified when this value changes, implement the urlSession(_:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:) delegate method.