MDN / Access-Control-Max-Age header
MDN / Access-Control-Max-Age header
The HTTP Access-Control-Max-Age indicates how long the results of a (that is, the information contained in the and headers) can be cached.
Syntax
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:
Access-Control-Max-Age: 600