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ETags Revisited – configure entity tags to improve cache performance on websites

An Entity tag (ETag) is a unique identifier assigned to a specific version of a given resource on a web server. ETags are used as a cache control mechanism to allow client browsers to make conditional requests. This lets caches work more efficiently by reusing unchanged resources on the client, and avoiding full server responses if the content has not changed. Efficient caching saves bandwidth and improves performance by delivering only what the client needs, not what it already has.

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