9.5.2.3 Envelope UDR

The Envelope UDR is included in the Received UDR. The following fields are included in the Envelope UDR:

Field
Description
deliveryTag (long)This field contains the server-assigned and channel-specific delivery tag.
exchange (string)This fields contains the name of the exchange used.
isRedeliver (boolean)This field indicates that the message has been previously delivered to this or another client.
routingKey (string)This field contains the routing key.