HTTP headers | Access-Control-Max-Age

The Access-Control-Max-Age HTTP header is a response header that gives the time for which results of a CORS preflight request that checks to see if the CORS protocol is understood and a server is aware using specific methods and headers, can be cached. The CORS preflight request contained in the Access-Control-Allow-Methods and Access-Control-Allow-Headers headers. Syntax:

Access-Control-Max-Age: <delta-seconds>

Directives: This header accepts a single directive mentioned above and described below:

<delta-seconds>: It specifies how many maximum seconds can the result be cached.

Note: If -1 is present then caching is disabled. Examples:

In this example, the results of a preflight request get cached for 200 seconds.
```
Access-Control-Max-Age: 200
```
In this example, the results are not allowed to be cached.
```
Access-Control-Max-Age: -1
```

To check this Access-Control-Max-Age in action, go to Inspect Element -> Network check the response header for Access-Control-Max-Age like below, Access-Control-Max-Age is highlighted you can see.

Supported Browsers: The browsers are compatible with HTTP Access-Control-Max-Age header are listed below:

Google Chrome 4.0
Internet Explorer 10.0
Opera 12.0
Firefox 3.5
Safari 4.0

HTTP headers | Access-Control-Max-Age

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