How are query parameters dynamically passed to an outbound REST request using an HTTP Request operation?

Refer to the exhibits.A web client sends a POST request to the HTTP Listener with the payload 'Hello-'. What response is returned to the web client?What response is returned to the web client?

Refer to the exhibits.The orders.csv file is read, then processed to look up the orders in a database. The Mule application is debugged in Any point Studio and stops at the breakpoint.What is the payload shown in the debugger at this breakpoint?

Refer to the exhibits.The input array of strings is processed by the batch job that processes, fitters, and aggregates the values.What is the last message logged by the Logger component after the batch job completes processing?

What should this endpoint return considering the API is build using standard practices?