Obtains a #GInputStream for the next request. See soup_multipart_input_stream_next_part() for details on the workflow.
the I/O priority for the request.
a #GCancellable.
callback to call when request is satisfied.
data for @callback
2.40
See Implementation
Obtains a #GInputStream for the next request. See soup_multipart_input_stream_next_part() for details on the workflow.