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Response headers will contain a "cf-ray" header or "server: cloudflare-nginx"


Both should be there, as well as 'Set-Cookie: __cfduid=...'

  $ curl -I okcupid.com
  Set-Cookie: __cfduid=...
  Server: cloudflare-nginx
  CF-RAY: 335f033b77742b76-AMS
EDIT: Better yet, make that 'curl -IL domain.com' to follow redirects because it may not show in the first response.




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