| contentLength | The value of the received Content-Length header. |
Callback, invoked with a Content-Length header is received.
This callback is invoked on the main thread.
Note: This callback is only called if a Content-Length header is received. If the remote server does not transmit a Content-Length header, but does include body data, then it is possible for ReceiveData to be invoked without receiving a call to this method.
Note: This callback may be invoked more than once. An example scenario would be a case where a redirect is encountered, followed by a standard response. If both the redirect and standard response include Content-Length headers, this method will be invoked twice.