{{HTTPSidebar}}
The Access-Control-Request-Headers
request header is used when issuing a {{glossary("preflight request")}} to let the server know which HTTP headers will be used when the actual request is made.
Header type | {{Glossary("Request header")}} |
---|---|
{{Glossary("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 |
---|---|---|
{{SpecName('Fetch','#http-access-control-request-headers', 'Access-Control-Request-Headers')}} | {{Spec2("Fetch")}} | Initial definition. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
{{Compat("http/headers/access-control-request-headers")}}
See also
- {{HTTPHeader("Access-Control-Request-Method")}}