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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


Access-Control-Max-Age: <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.


Cache results of a preflight request for 10 minutes:

Access-Control-Max-Age: 600 


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support4123.510124
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic support2.1 Yes Yes4 Yes123.2

See also

Document Tags and Contributors

 Contributors to this page: fscholz, mushang11, Jothay, teoli
 Last updated by: fscholz,