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Idempotency — Two Clicks, One Charge

You cannot stop the retry. You can only stop the duplicate

중급 · Lessons 30 · Lab 10

Curriculum

Retries and Duplicates

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

Reference docs