Access-Control-Request-Headers request header is used by browsers when issuing a preflight request to let the server know which HTTP headers the client might send when the actual request is made (such as with
setRequestHeader()). The complementary server-side header of
Access-Control-Allow-Headers will answer this browser-side header.
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
|Fetch Standard |
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