Access-Control-Max-Age

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The HTTP Access-Control-Max-Age response header indicates how long the results of a preflight request (that is, the information contained in the Access-Control-Allow-Methods and Access-Control-Allow-Headers headers) can be cached.

Header type Response header
Forbidden header name No

Syntax

http
Access-Control-Max-Age: <delta-seconds>

Directives

<delta-seconds>

Maximum number of seconds for which the results can be cached as an unsigned non-negative integer. Firefox caps this at 24 hours (86400 seconds). Chromium (prior to v76) caps at 10 minutes (600 seconds). Chromium (starting in v76) caps at 2 hours (7200 seconds). The default value is 5 seconds.

Examples

Cache results of a preflight request for 10 minutes:

http
Access-Control-Max-Age: 600

Specifications

Specification
Fetch
# http-access-control-max-age

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Access-Control-Max-Age

Legend

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Full support
Full support

See also