I want to use the REST API of Nifi in particularly
But I'm not to found how I ca get the transactionId?
anyone help me?
That REST end-point was introduced when NiFi introduced Site-To-Site over HTTP, previously Site-To-Site was always over TCP. There is a Site-To-Site Java client which probably makes more sense to use rather than going directly to the API:
Set the transport protocol to HTTP.