Fixing a Mock integration

API Gateway will happily route a request to a method that never touches your backend at all. A mock integration answers straight from configuration — no Lambda invoked, no DynamoDB read, just whatever canned response the integration was told to return. That's genuinely useful while an API's shape is still being designed. It's also exactly what a half-wired method looks like from the outside: a real URL, a real 200, and a response that never came from your code.