What Idempotency Means and Why It Matters for Safe API Retries

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Idempotency is a core concept in distributed systems, meaning that performing the same operation multiple times produces the same result as doing it once. The principle is critical in production environments where network failures and timeouts force systems to retry requests. HTTP methods carry different idempotency guarantees: GET, PUT, and DELETE are generally safe to retry, while POST and certain PATCH operations are not. A non-idempotent retry can lead to serious consequences such as double-charging customers, sending duplicate notifications, or corrupting stored data. Understanding which operations are idempotent is essential for building reliable APIs and distributed systems that handle real-world network failures gracefully.

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