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Using stale-while-revalidate caching for faster, honest VIN lookups

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A technical article describes applying the stale-while-revalidate caching strategy to a free VIN decoding service. The method allows the service to serve a cached, slightly stale result immediately while refreshing it in the background. This improves perceived speed for repeat lookups without falsely advertising data as freshly live. The system labels each response with its exact freshness state to ensure user interface transparency. The technique is distinct from other caching patterns like ETag validation or negative caching.

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