The Access-Control-Request-Headers request header is used when issuing a preflight request to let the server know which HTTP headers will be used when the actual request is made.
| Header type | Request header |
|---|---|
| Forbidden header name | yes |
Syntax
Access-Control-Request-Headers: <header-name>, <header-name>, ...
Directives
- <header-name>
- A comma-delimited list of HTTP headers that are included in the request.
Examples
Access-Control-Request-Headers: X-PINGOTHER, Content-Type
Specifications
| Specification | Status | Comment |
|---|---|---|
| Fetch The definition of 'Access-Control-Request-Headers' 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 |
|---|---|---|---|---|---|---|---|
| Access-Control-Request-Headers | 4 | 12 | 3.5 | 10 | 12 | 4 | ? |