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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.
A value of -1 will disable caching, requiring a preflight OPTIONS check for all calls.
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
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 4 | 12 | 3.5 | 10 | 12 | 4 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | 2.1 | Yes | Yes | 4 | 12 | 3.2 | Yes |