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Подскажите по заголовкам Pragma header, Expires


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Здравствуйте.

Расскажите, пожалуйста, как могут влиять на сайт заголовки, что будет, если они прописаны (не прописаны)

Строки, где они встретились:

1. The Expires header's value isn't valid date.
2. The Pragma header is deprecated
3. The compressed response is negotiated, but doesn't have an appropriate Vary header
4. Pragma: no-cache is a request directive, not a response directive.

Буду благодарен пояснениям строк и самих заголовков.

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