HTTP Headers Checker
Inspect HTTP response headers to verify server configurations, cache controls, and critical security directives like CSP and HSTS.
Free HTTP Headers Checker
HTTP headers are the silent signals your server sends to every browser and search engine bot. Our free checker strips back the curtain so you can validate caching, confirm security policies, and catch server misconfigurations before they cost you rankings.
Free Security Header Audit
Our tool checks all six critical security headers and flags which are missing, misconfigured, or absent — protecting your users and your Google trust score.
Strict-Transport-Security
Forces HTTPS-only connections, protecting against downgrade attacks.
Content-Security-Policy
Restricts what scripts, styles, and resources the browser can load — eliminating XSS.
X-Frame-Options
Prevents your site being embedded in iframes on malicious third-party pages.
X-Content-Type-Options
Stops browsers sniffing MIME types, preventing content-type confusion attacks.
Permissions-Policy
Controls which browser features (camera, microphone) pages can access.
Referrer-Policy
Dictates how much referrer info is sent when users navigate away from your site.
How the Free HTTP Headers Checker Works
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Enter Any URL
Paste any web address and click Analyze. Our server makes a direct HTTP request to the target, capturing the exact headers as they are returned — bypassing browser caches and client-side modifications.
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Raw Header Display
Every response header is shown exactly as delivered: key, value, and any nested directives. Nothing is hidden, normalized, or filtered — you see what Google sees.
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Security Header Audit
We cross-reference the response against the six most critical security headers and return a clear Pass/Fail for each. Missing headers are prominently flagged with remediation guidance.
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Caching & Performance Insights
Cache-Control, Expires, ETag, and Vary headers are extracted and displayed so you can immediately verify whether your CDN or origin server is caching responses as intended.
Why Missing Security Headers Hurt SEO
Google operates a Safe Browsing program that actively scans websites for malware, phishing, and deceptive content. Sites that get flagged are demoted in rankings or completely removed from search results. Implementing robust security headers such as CSP and HSTS dramatically reduces the attack surface that hackers exploit to inject malicious content — protecting both your users and your Google ranking.
Caching Headers: The Free Performance Win
Page speed is a confirmed Google ranking factor. Correct Cache-Control headers with aggressive max-age values (e.g., max-age=31536000 for static assets) mean returning visitors load JavaScript, CSS, and images from their local browser cache rather than from your server. This cuts load times by 60 to 80 percent for repeat visits and dramatically improves Core Web Vitals scores.
Validating Your CDN With Response Headers
If you use Cloudflare, Fastly, or AWS CloudFront, you are paying for edge caching. Our tool shows CDN-injected headers like cf-cache-status: HIT or x-cache: Miss from cloudfront. A persistent MISS status means every request hits your origin server — you are paying for a CDN that is not caching. Our free checker makes this immediately visible.