Vary Header Accept-Encoding
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The Accept-Encoding request HTTP header advertises which content encoding, usually a compression algorithm, the client is able to understand. Using content negotiation, the server selects one of the proposals, uses it and informs the client of its choice with the Content-Encoding response header.
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Private Cache-Control Header
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The Cache-Control general-header field is used to specify directives for caching mechanisms in both requests and responses. Caching directives are unidirectional, meaning that a given directive in a request is not implying that the same directive is to be given in the response.
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No Cache Content
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Forces caches to submit the request to the origin server for validation before releasing a cached copy.
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NO Store HTTP Cache-Control
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The cache should not store anything about the client request or server response.
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Proxy Revalidate HTTP Cache-Control
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Same as must-revalidate, but it only applies to shared caches (e.g., proxies) and is ignored by a private cache.
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NO Transform HTTP Cache-Control
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No transformations or conversions should be made to the resource. The Content-Encoding, Content-Range, Content-Type headers must not be modified by a proxy.
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