MultipartInputStream
Creates a new #SoupMultipartInputStream that wraps the class@Gio.InputStream obtained by sending the class@Message.
Reads should not be done directly through this object, use the input streams returned by method@MultipartInputStream.next_part or its async counterpart instead.
Return
a new #SoupMultipartInputStream
Parameters
msg
the #SoupMessage the response is related to.
baseStream
the #GInputStream returned by sending the request.
constructor(pointer: <Error class: unknown class><<Error class: unknown class>>)