DevUtilsNow
Browse tools
// http header · caching header

Expires

Absolute date after which the response is stale

What the Expires header does

Expires gives an absolute date after which the response is considered stale. It predates Cache-Control and is ignored when Cache-Control: max-age is present, so Cache-Control is preferred today.

Example

Expires: Wed, 19 Aug 2026 07:28:00 GMT

Where it's used

Expires 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.