Access-Control-Request-Headers Header

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About

The HTTP 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 fetch() or XMLHttpRequest.setRequestHeader()); the complementary server-side header of Access-Control-Allow-Headers will answer this browser-side header 1.

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References

  1. MDN. “Access-Control-Request-Headers”. Available at: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Request-Headers . (Accessed: [2025-05-11 Sun 17:20]). ↩︎

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