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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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 4Edge Full support 12Firefox Full support 3.5IE Full support 10Opera Full support 12Safari Full support 4WebView Android Full support 2Chrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support 12Safari iOS Full support 3.2Samsung Internet Android Full support Yes

Legend

Full support  
Full support

See also

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