A CORS-safelisted response header is an HTTP header which has been safelisted so that it will not be filtered when responses are processed by CORS, since they're considered safe (as the headers listed in
Access-Control-Expose-Headers
). By default, the safelist includes the following response headers:

Examples

Extending the safelist
You can extend the list of CORS-safelisted response headers by using the
Access-Control-Expose-Headers
header:
Access-Control-Expose-Headers: X-Custom-Header, Content-Length

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