Caching
Vary
Tells caches which request headers to consider when deciding whether to serve a cached response.
Syntax
Vary: <header-name>, <header-name>Example
Vary: Accept-Encoding, Accept-LanguageDescription
Vary tells caches which request headers affect the response. Different header values need separate cached versions.
Common values: Accept-Encoding, Accept-Language, Cookie.
Careful with Vary: Cookie or Vary: * — these effectively disable CDN caching.
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