What does this Security Headers Checker measure?

It checks important HTTP response headers such as Strict-Transport-Security, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and related browser isolation policies.

Why do these headers matter for outages and trust?

Missing or weak headers can increase exploit risk and cause browser behavior differences during incidents. A clear header baseline reduces unexpected failures and security regressions.

Can this replace a full penetration test?

No. This tool is a fast baseline audit. Use it to catch obvious gaps quickly, then follow with deeper security testing and review in your SDLC.

Security Tools

Security Headers Checker

Audit critical HTTP security headers in one report, detect missing controls, and share clear remediation notes with engineering teams.

This checker is useful after deploys, CDN changes, WAF updates, and domain migrations where security policies can silently drift.

For broader outage workflows, pair this with the HTTP Status Checker, Redirect Checker, and our post-deploy outage checklist.

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Run a check to audit security headers.

The tool reviews key response headers, score quality, and highlights missing protections.

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Domain-

Score-

Final URL-

Header Findings Waiting for check

Advanced: Raw Response Headers

Raw Response Headers From final URL

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How to Use This Header Audit in Real Workflows

Release Validation

Run the checker immediately after deployments to catch missing HSTS, CSP, and anti-clickjacking controls before users report trust or browser issues.

Incident Containment

When a security incident occurs, this tool gives a fast baseline of header posture so teams can prioritize high-impact fixes with concrete evidence.

Support Escalations

Copy the summary into tickets to reduce back-and-forth. It includes score, missing critical headers, and the final URL that served the response.

Compliance Hygiene

Use recurring checks on core domains and subdomains to prevent policy drift when platform teams update edge, caching, or security middleware.

Related Guides

Use these resources when header problems overlap with uptime or access incidents.

Website Down After Deploy: Recovery Checklist

A practical order of operations to isolate whether failures come from routing, TLS, headers, or app-level regressions.

Origin vs Edge Errors Decision Tree

Use this when edge behavior differs from origin behavior and security policy enforcement is inconsistent by path.

How to Reduce False Positives in Uptime Monitoring

Helpful for separating genuine outages from policy or routing effects that look like downtime in automated checks.

Frequently Asked Questions

What does this checker evaluate?

It evaluates high-value HTTP response headers for browser security and policy hardening. You get clear signals for missing, weak, and present controls with practical notes.

Should I focus only on the score?

No. The score is a quick benchmark. Always review critical missing headers and contextual notes, especially for public login pages and high-risk endpoints.

Can this replace a full security review?

No. It is a rapid baseline tool. Use it to catch obvious issues quickly, then pair with deeper security testing and architecture review.

Is this Security Headers Checker free?

Yes. It is free for normal checks.