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Access-Control-Max-Age

The 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

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

Directives

<delta-seconds>
Maximum number of seconds the results can be cached.
Firefox caps this at 24 hours (86400 seconds) and Chromium at 10 minutes (600 seconds). Chromium also specifies a default value of 5 seconds.
A value of -1 will disable caching, requiring a preflight OPTIONS check for all calls.

Examples

Cache results of a preflight request for 10 minutes:

Access-Control-Max-Age: 600

Specifications

Specification Status Comment
Fetch
The definition of 'Access-Control-Max-Age' in that specification.		 Living Standard Initial definition.

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 4 12 3.5 10 12 4
Feature Android webview Chrome for Android Edge mobile Firefox for Android IE mobile Opera Android iOS Safari
Basic support 2.1 Yes Yes 4 Yes 12 3.2

See also

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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Max-Age