A general-purpose UploadHandler subclass, using a native-code memory buffer.
This subclass copies input data into a native-code memory buffer at construction time, and transmits that data verbatim as HTTP request body data.
|General constructor. Contents of the input argument are copied into a native buffer.
|Determines the default Content-Type header which will be transmitted with the outbound HTTP request.
|The raw data which will be transmitted to the remote server as body data. (Read Only)
|Returns the proportion of data uploaded to the remote server compared to the total amount of data to upload. (Read Only)
|Signals that this [UploadHandler] is no longer being used, and should clean up any resources it is using.