Value for "message-id" is always "1"

[krunalbhavsar]

I submits some unique id (string) in a header (dictionary) of sendMessage, while sending a message.
But receiver always receives value "1" for "message-id". Original value for "message-id" is replaced with value "1" during message transition.

Other information of header remains same.

My concern behind using this parameter value, reply an acknowledgement to sender. (I can use any other key in header to fulfil my requirement) But I think is message-id is used for the same purpose (acknowledgement)