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Why a 200 OK Response Can Still Display the Wrong Data to Users

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A subtle UI bug can cause web forms to display results from an outdated request when a user edits their input before the server responds. For example, if a user changes a shipping destination mid-request, the earlier response may render beneath the newer input, making incorrect data appear valid. This race condition is independent of server correctness — the response is accurate for its original request, but wrong for the current user intent. Developers can prevent this by assigning each request a revision number tied to the user's latest input, and only allowing the most current revision to update the interface. Stale successes, errors, and loading states must all be guarded against to ensure the displayed result always reflects what the user actually submitted.

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