Idempotency ensures that repeated identical requests produce the same result, even if they are retried due to network issues, timeouts, or other temporary issues. This behavior prevents duplicate resource creation or unintended side effects in APIs that accept POST or PATCH requests.
The `X-Idempotency-Key` HTTP header plays a central role in implementing idempotency. Clients use this header to uniquely identify requests, enabling the API to track and manage their outcomes across retries.