How can I detect if a website is using a Cloudflare Captive Portal?

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Grade: Education Subject: Support
How can I detect if a website is using a Cloudflare Captive Portal?
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Detecting a Cloudflare Captive Portal involves looking for specific HTTP headers, JavaScript challenges, and redirects. Common indicators include the presence of `CF-Challenge` or `CF-RAY` headers in the response, the existence of a `/cdn-cgi/challenge` URL, or JavaScript code related to Cloudflare's challenge solving mechanisms. Network analysis tools can also reveal the redirection patterns characteristic of captive portals.