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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-Language

Description

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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Related Headers

Age
Indicates how long a response has been stored in a cache, in seconds since generation.
Cache-Control
The primary header for controlling caching behavior, defining how and for how long responses can be cached.
Expires
Specifies a date/time after which the response is considered stale. Superseded by Cache-Control max-age.
Pragma
Legacy HTTP/1.0 header for backward-compatible cache control. Replaced by Cache-Control.

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