"The Access-Control-Allow-Credentials header be present on both the preflight and actual request ..."
But according your code, 'Access-Control-Allow-Credentials' header Only be present on actual request, I am confusing.
I updated the sentence to be more clear. The Access-Control-Allow-Credentials header only needs to be present on the non-preflight response (the actual response). Cookies are only sent in the actual response. If the Access-Control-Allow-Credentials header is also present in the preflight response then cookies will still not be sent because it's the preflight response. Cookies are only sent in the non-preflight actual response.
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