← recall

idempotent term

same input produces same result, safe to retry

Idempotent operations can be retried without side effects (e.g., PUT, DELETE). Non-idempotent operations (POST without an idempotency key) cause duplicates on retry.

aliases: safely retryable

topics: correctness, api-design

references:

• MDN — Idempotent HTTP methods
• Stripe — Idempotent requests