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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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support4123.510124
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support2.1 Yes Yes4123.2 Yes

See also

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