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, 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.
Cache results of a preflight request for 10 minutes:
Access-Control-Max-Age: 600
| Specification |
|---|
| Fetch Standard # http-access-control-max-age |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
Access-Control-Max-Age |
4 |
12 |
3.5 |
10 |
12 |
4 |
2 |
Yes |
4 |
12 |
3.2 |
Yes |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Max-Age