Can Call onRequestTrailers() and onResponseTrailers unconditionally???

[coolg92003]

Hi Expert,
If there is no Trailer in Request/Response, then I have no chance to add Trailer when after processing Request/Response.
Is it possible call those two API onRequestTrailers() and onResponseTrailers unconditionally?
if there is Not anything to do, then it can return Continue directly.

thanks
Cliff

[PiotrSikora]

You can add trailers from the request/response body callbacks (e.g. upon receiving end_of_stream=True, which implies that there are no trailers).