Your API uses optimistic concurrency control with ETags. A client sends an If-Match header with a stale ETag during an update. What status code and response body do you return, and why?

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Your API uses optimistic concurrency control with ETags. A client sends an If-Match header with a stale ETag during an update. What status code and response body do you return, and why?

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