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


Access-Control-Request-Headers: <header-name>, <header-name>, ...


A comma-delimited list of HTTP headers that are included in the request.


Access-Control-Request-Headers: X-PINGOTHER, Content-Type


Specification Status Comment
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

Document Tags and Contributors

Contributors to this page: WayneCui, mushang11, fscholz, teoli
Last updated by: WayneCui,