Network Deployment (Distributed operating systems), v8.0 > Develop and deploying applications > Develop Service integration > Program mediations > Add mediation function to handler code
Work with the message header
We can add function to a preexisting mediation handler to operate on the message header. Create or open a basic mediation handler in an EJB project (see Write a mediation handler. It is useful to have understood the elements of the task Work with the message payload, because some of those elements are used in this task
There are different types of field that you can set in message headers. Importantly, you can set the forward and return routing addresses for messages after they have been mediated at the current destination. In addition there are other fields that you can set, such as priority and reliability for the message and its reply, and the remaining time before the message (or the reply) expires.
Procedure
- To set routing addresses in the message header, see Set routing addresses in a message header.
- To set all other fields in the message header, see Work with non-routing path fields in a message header.