Cloudflare Checker: CDN Detection, Security Headers & Protection Rating

If you manage a website and aren't sure whether it's running behind Cloudflare, it's worth checking. Cloudflare isn't just a CDN — it's a protection and acceleration layer that sits between your users and your server, and how you configure security headers on it has a real impact on your actual security posture.

What Cloudflare is and how it works

Cloudflare sits between DNS and your origin server. When someone visits your domain, the request passes through Cloudflare's network before reaching your server. This lets Cloudflare:

• Cache content at edge nodes near users — reducing latency
• Filter malicious traffic — DDoS attacks, bad bots, injection attempts
• Analyze threats — count blocked requests by type and country
• Manage SSL/TLS — Cloudflare issues and auto-renews certificates

The simplest way to identify it: the cf-ray response header appears on every response from a Cloudflare-protected site.

Important security headers

Whether or not you use Cloudflare, security headers are something you should verify and configure correctly. The six most important:

Strict-Transport-Security (HSTS) — forces browsers to always use HTTPS, preventing downgrade attacks. Without this, users can be redirected to HTTP via a MITM attack.

X-Frame-Options — prevents your site from being embedded in another page's iframe (clickjacking). Set to DENY or SAMEORIGIN.

Content-Security-Policy (CSP) — declares allowed resource sources, reducing XSS risk. The most complex header on the list but also the most important.

X-Content-Type-Options — set to nosniff so browsers don't guess MIME types, blocking a class of script injection.

Referrer-Policy — controls what information gets sent in the Referer header when a user navigates away. Important for privacy.

Permissions-Policy — limits browser API access (camera, microphone, geolocation). Formerly called Feature-Policy.

Check Cloudflare status and security headers for free — the tool detects whether a site is behind Cloudflare, lists all 6 security headers, and rates the overall protection level.

Cloudflare free vs paid — the security difference

The free plan already provides: CDN, basic DDoS protection, SSL, basic WAF rules (100 managed rules), and daily analytics.

Paid plans add: advanced Bot Management (bot score analysis), flexible Rate Limiting, Workers (edge computing), and real-time analytics.

For most small and medium websites, the free plan is sufficient to block the majority of automated attacks and meaningfully improve page load times.

Conclusion

Knowing whether your site uses Cloudflare and whether security headers are properly configured is the first step in a basic security assessment. If any of the six headers above are missing, that's a concrete action you can take immediately without complex code changes.

Connect Cloudflare to ClickSentinel to automatically track threats, traffic breakdown, and cache performance every day.