The number of bytes that the task expects to receive in the response body.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 2.0+
This value is determined based on the
Content-Length header received from the server. If that header is absent, the value is
Obtaining Task Progress
A representation of the overall task progress.
The number of bytes that the task has received from the server in the response body.
The number of bytes that the task has sent to the server in the request body.