developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag

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      The HTTP ETag (entity tag) response header is an identifier for a specific version of a resource. It lets caches be more efficient and save bandwidth, as a web server does not need to resend a full response if the content has not changed. Additionally, ETags help to prevent simultaneous updates of a resource from overwriting each other ("mid-air collisions").

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