18.18Scenario 17 — Error-to-HTTP mapping

A clean conceptual design:

APP:INVALID_CUSTOMER
→ 400

APP:CUSTOMER_NOT_FOUND
→ 404

SALESFORCE:CONNECTIVITY
→ 503

ANY
→ 500

You might use:

vars.httpStatus

and set a normalized response:

%dw 2.0
output application/json
---
{
    code: "CUSTOMER_SERVICE_UNAVAILABLE",
    message: "Customer service is temporarily unavailable",
    correlationId: correlationId
}

Do not expose raw connector internals unnecessarily.