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Idempotency for Reliable APIs

Why idempotency matters When you build an API, retries are inevitable. Clients lose connections, timeouts happen, and users double-click buttons.

  • Idempotency prevents duplicate actions and side effects in APIs
  • HTTP GET, PUT, DELETE are inherently idempotent while POST isn't
  • POST idempotency achieved via unique Idempotency-Key header

Failed Webhook Backoff and DLQ Redrive for 3 Marketplace Deadline Guarantees

Short answer: A marketplace renewal reminder should enter the dead-letter queue when another attempt cannot finish before its business deadline; use at-least-once delivery, a stable idempotency key…

  • Marketplace reminders must meet deadlines or go to dead-letter queue.
  • Exponential backoff with jitter prevents synchronized failure waves.
  • Idempotent delivery IDs ensure safe at-least-once processing.

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