Selected option: "the generated one is returned from POST".
If user set a message_id in the POSTed sample, it is just ignored (no error raised) and overridden by the generated value when sent into the pipeline and the generated value is returned in the samples' list too.
Selected option: "the generated one is returned from POST".
If user set a message_id in the POSTed sample, it is just ignored (no error raised) and overridden by the generated value when sent into the pipeline and the generated value is returned in the samples' list too.