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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


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

Feature Chrome Edge Firefox Internet Explorer Opera Safari Servo
Basic Support4123.510124?
Feature Android Chrome for Android Edge Mobile Firefox for Android IE Mobile Opera Mobile Safari Mobile
Basic Support2.1(Yes)(Yes)1.0(Yes)123.2

See also

Document Tags and Contributors

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