i your [[redirects]] after to = "", you can add a new line with:
headers = { } to add the ACAO
actually: https://answers.netlify.com/t/netlify-does-not-send-custom-headers-in-a-redirect-file-using-https-in-the-to/25773/14
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quote: This returns the 301 response but with the “x-from: Netlify” header. If there are other questions, please let us know.
GOOD NOW!