Access-Control-Request-Headers

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

See also

• Access-Control-Request-Method