public async Bytes load_bytes_async (Cancellable? cancellable = null, out string? etag_out) throws Error
Asynchronously loads the contents of this as Bytes.
callback should call load_bytes_async.end to get the result of this asynchronous operation.
See load_bytes for more information.
a Cancellable or null
a TaskReadyCallback to call when the request is satisfied
the data to pass to callback function