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// http header · caching header

Vary

Which request headers affect the cached response

What the Vary header does

Vary lists the request headers that affect which response a cache should serve — Vary: Accept-Encoding keeps gzip and Brotli variants separate. Getting it right prevents caches from serving the wrong representation to a client.

Example

Vary: Accept-Encoding

Where it's used

Vary is a caching header. Caching headers control how browsers and proxies store and reuse responses.

Other caching headers

Cache-Control Age Expires Vary
TOOL

HTTP Headers Parser

Turn a block of raw headers into readable JSON.

REFERENCE

All HTTP Headers

Common request, response, caching, CORS, and security headers.

GUIDE

How to Read and Parse HTTP Headers

The anatomy of headers and how to work with them.