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Sree Vardhan VandClaude Opus 5.5 8f6dab39e8 Explain idempotency keys in API Design "Idempotency" topic (#10438)
The topic said idempotency "sometimes" applies to POST but did not explain
how. Clarify which HTTP methods are idempotent by definition and describe
idempotency keys, the common way to make POST/PATCH safe to retry:
client-generated unique key, stored result replayed on repeats, reuse with
a different payload rejected, keys expire.

Add MDN, the IETF Idempotency-Key header draft and Stripe's reference
implementation as resources.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-13 10:31:03 +02:00
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