https://domain-a.com
may need to fetch resources from an API hosted at https://domain-b.com
. With CORS enabled, the browser permits this interaction if the API server provides the appropriate CORS headers.
OPTIONS
method to ensure the server approves the actual request.
*
allows access from all origins but is unsuitable for credentialed requests.
*
):
*
for Access-Control-Allow-Origin
can lead to unintended exposure."No 'Access-Control-Allow-Origin' header is present"
"CORS preflight did not succeed"
OPTIONS
requests correctly."The request was redirected but preflight does not allow redirects"