Request-Reply with request ID

[RangelAngelov]

Hello team,

Quick question. We have implemented a rather simple req - resp pattern with ROUTER and DEALER sockets. Recently, we have arrived to the conclusion that our messages should contain Request ID metadata. Is there a standardised way to add metadata to messages being sent (something like Http Headers), or should said data be prepended to the message itself and sent with ZMQ.SNDMORE flag?

Thanks