A client is updating a resource that another client modified moments ago. You need to prevent lost updates. Compare ETags, version numbers, and last-modified timestamps. What do you implement?

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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.

A client is updating a resource that another client modified moments ago. You need to prevent lost updates. Compare ETags, version numbers, and last-modified timestamps. What do you implement?

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