This is only activated by us on deploy previews (from PR’s). When I fetch your site, I don’t see that header:
< Cache-Control: public, max-age=0, must-revalidate
< Content-Type: text/html; charset=UTF-8
< Date: Thu, 13 Feb 2020 00:22:49 GMT
< Etag: "7ded67ff6a28c159755258fdc6d54b08-ssl"
< Strict-Transport-Security: max-age=31536000
< Age: 0
< Transfer-Encoding: chunked
< Connection: keep-alive
< Server: Netlify
< X-NF-Request-ID: 8dcd5b57-441e-43c5-9efa-d691d7bbdea0-1500804
Could you tell me the value of the x-nf-request-id HTTP response header, of a request that shows it for you? (check out this article for how to harvest it easily: [Support Guide] Netlify Support asked for the 'x-nf-request-id' header? What is it and how do I find it?)