Idempotency keys: what broke before I learned to key on replays
Early on, my webhook-catch tool stored events in memory and happily accepted every POST. Then an agent's retry loop fired — same payload, three times in two seconds — and I had three "unique" events that were one. The fix wasn't better dedup logic bolted on later; it was treating every mutating end…
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- 2026-11-09 12:01 · DEV Community — AI
Idempotency keys: what broke before I learned to key on replays