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Security Headers Check
Inspect the raw HTTP response headers of a web server to ensure modern client-side browser protections are enabled.
SUBJECT:
HTTP Response Headers
HEADERS:
CSP, HSTS, X-Frame-Options
PROTECTIONS:
XSS, Clickjacking, MIME-Sniffing
What is Security Headers Check?
Security Headers are instructions sent by the server to the visitor's browser. They tell the browser to restrict dangerous behaviors, like executing inline scripts or loading the site inside a hidden
How it Works
The analyzer performs a fast `HEAD` request to a URL and specifically searches the returned metadata for the presence and syntactic correctness of critical headers like Content-Security-Policy (CSP) and Strict-Transport-Security.
Key Use Cases
Protecting banking and SaaS web applications from Cross-Site Scripting (XSS).
Passing automated corporate security, SOC2, or penetration testing audits.
Preventing "Clickjacking" attacks using the X-Frame-Options DENY directive.
Advanced Details
Implementing a strict Content-Security-Policy is notoriously difficult, as it requires whitelisting every single external script and image domain your site uses, otherwise the browser will forcibly block them from loading.
Cybersecurity Pros & Cons
Security Advantages
- A comprehensive security headers implementation provides client-side defence in depth covering XSS, clickjacking, and MIME sniffing in a single deployment.
- HSTS max-age with includeSubDomains prevents MITM attacks on the entire domain including all subdomains.
- Permissions-Policy header restricts access to browser APIs (camera, microphone) — critical for protecting users from malicious ad scripts.
- Security header grading (A+/F) provides a clear, actionable security posture metric for executive reporting.
Security Limitations
- An overly strict CSP that breaks legitimate site functionality creates pressure to weaken it, negating the security benefit.
- Security headers are enforced by the browser — server-side attacks (SQL injection, SSRF) are completely unaffected.
- Legacy browsers and enterprise proxy tools may strip or modify security headers, silently removing their protection.
- Setting security headers on a site with third-party scripts requires extensive testing — an incorrect CSP can cause user-visible breakage.
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