The Access-Control-Max-Age response header indicates how long the results of a preflight request (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>


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.


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  

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari Servo
Basic Support4123.510124?
Feature Android Chrome for Android Edge Mobile Firefox for Android IE Mobile Opera Mobile Safari Mobile
Basic Support2.1(Yes)(Yes)1.0(Yes)123.2

See also

Document Tags and Contributors

 Contributors to this page: fscholz
 Last updated by: fscholz,