[zeromq-dev] empty packet if REQ

[Martin Sustrik]

Ilja,

> Please clarify if it is expected there is empty packet (or message part, not sure about correct term) between identity and payload if REQ
> and there is no such packet if XREQ.
> 
> Using 2.0.7.

Yes. It's the bottom of the backtrace stack. The message is composed of 
identites specifying the path back to the original requester. The list 
is terminated by an empty message part and followed by application data.

Martin