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The Access-Control-Allow-Origin response header indicates whether the response can be shared with resources with the given origin.
| Header type | Response header |
|---|---|
| Forbidden header name | no |
Syntax
Access-Control-Allow-Origin: * Access-Control-Allow-Origin: <origin>
Directives
- *
- For requests without credentials, the server may specify "*" as a wildcard, thereby allowing any origin to access the resource.
- <origin>
- Specifies a URI that may access the resource.
Examples
To allow any resource to access your resource, you can specify:
Access-Control-Allow-Origin: *
To allow https://developer.mozilla.org to access your resource, you can specify:
Access-Control-Allow-Origin: https://developer.mozilla.org
CORS and caching
If the server specifies an origin host rather than "*", then it must also include Origin in the Vary response header to indicate to clients that server responses will differ based on the value of the Origin request header.
Access-Control-Allow-Origin: https://developer.mozilla.org Vary: Origin
Specifications
| Specification | Status | Comment |
|---|---|---|
| Fetch The definition of 'Access-Control-Allow-Origin' 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 | Servo |
|---|---|---|---|---|---|---|---|
| Basic Support | 4 | 12 | 3.5 | 10 | 12 | 4 | ? |
| Feature | Android | Chrome for Android | Edge Mobile | Firefox for Android | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic Support | 2.1 | (Yes) | (Yes) | 1.0 | (Yes) | 12 | 3.2 |