MuleSoft Exam MCIA-Level-1 Topic 11 Question 40 Discussion

Correct answer is Mule correlation ID By design, Correlation Ids cannot be changed within a flow in Mule 4 applications and can be set only at source. This ID is part of the Event Context and is generated as soon as the message is received by the application. When a HTTP Request is received, the request is inspected for 'X-Correlation-Id' header. If 'X-Correlation-Id' header is present, HTTP connector uses this as the Correlation Id. If 'X-Correlation-Id' header is NOT present, a Correlation Id is randomly generated. For Incoming HTTP Requests: In order to set a custom Correlation Id, the client invoking the HTTP request must set 'X-Correlation-Id' header. This will ensure that the Mule Flow uses this Correlation Id. For Outgoing HTTP Requests: You can also propagate the existing Correlation Id to downstream APIs. By default, all outgoing HTTP Requests send 'X-Correlation-Id' header. However, you can choose to set a different value to 'X-Correlation-Id' header or set 'Send Correlation Id' to NEVER.