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Access-Control-Max-Age

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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

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.

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 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

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