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Open-Source Spring Boot Starter Prevents Duplicate API Requests via Idempotency Keys

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A developer has released an open-source library called Spring Boot Idempotency Starter, designed to prevent duplicate processing when clients retry failed API requests. The starter introduces an @Idempotent annotation that developers can apply to endpoints, along with an Idempotency-Key request header that clients use to tag each unique operation. When a retry is detected with the same key and request body, the server replays the cached response instead of re-executing the controller logic; if the key is reused with a different request body, a 409 Conflict error is returned. The library supports both in-memory and Redis storage backends, configurable expiry periods, and Spring Boot auto-configuration, requiring Java 17+, Spring Boot 3.x, and Maven 3.8+. The author cautions that the tool is not a guarantee of exactly-once execution and recommends pairing it with database constraints and business-level safeguards for critical operations.

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