Message Header Reference
You can map message headers between your external systems and event broker services. The headers that are available to you depend on what external system you are using and whether you are creating a source or target Micro-Integration.
On the source side of a Flow, header values are exactly what the publishing application set when it created the message. As a consumer, the Micro-Integration cannot add or change a header value that the publisher didn't set. If an event broker service is your source, this includes solace_* headers such as timestamps and sequence numbers, which depend on the session settings the original publishing application used. On the target side, the Micro-Integration is itself the publishing application, so it can populate some headers automatically based on your configuration, or set them explicitly using transformation expressions.
For information about the message headers you can map, see: