Obtains a gio.input_stream.InputStream for the next request.
See soup.multipart_input_stream.MultipartInputStream.nextPart for details on the workflow.
the I/O priority for the request.
a #GCancellable.
callback to call when request is satisfied.
Obtains a gio.input_stream.InputStream for the next request.
See soup.multipart_input_stream.MultipartInputStream.nextPart for details on the workflow.