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What domain? I'll get an issue filed to stop sending warning emails in cases like this. Thanks!

It's studio.zerobrane.com (pointing to pkulchenko.github.io/ZeroBraneStudio); thanks for looking into it!

If you have a subdomain, there's no need to use Cloudflare - if you CNAME this domain to pkulchenko.github.io you'll use GitHub's CDN automatically.