Idempotency — Two Clicks, One Charge
일부러 멱등하지 않게 만든 결제 API 를 고쳐 나갑니다. 멱등성 키, 요청 본문 해시, 동시 요청 경쟁, 재시작·다중 인스턴스까지 실제로 부딪혀 봅니다.
중급 · 레슨 30 · 실습 10
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커리큘럼
Idempotent requests still need retry budgets
Keep orders and events consistent with a transactional outbox
The same key is not always the same request
Stop an old worker from overwriting a new result
A validly signed webhook arrived twice
Preserve balances when a transfer fails halfway
Two customers reserved the last item
Resume imports from the last committed checkpoint
Deleting an idempotency key ends its guarantee
참고 문서
