Free Online HTTP Security Headers Auditor: Analyze Web Security Policies

Modern web security relies heavily on HTTP response headers to instruct browsers how to handle sensitive site content safely. Configuring robust security headers provides a vital line of defense against common web vulnerabilities like Cross-Site Scripting (XSS), clickjacking, MIME-type sniffing, and man-in-the-middle attacks.

However, many web applications, REST APIs, and SaaS platforms deploy with missing or misconfigured security headers. Without proper security audits, developers often miss gaps in their Content Security Policy (CSP) or Transport Layer Security settings until a security assessment flags them.

In this guide, we will explore how to audit website response headers safely using Velona's Free Online HTTP Security Headers Auditor, a fast tool that evaluates security posture in real time.

Essential HTTP Security Headers Every Site Needs

Auditing your web application headers ensures your server delivers essential security directives to client browsers:

• Content-Security-Policy (CSP): Restricts the origins from which scripts, stylesheets, and images can load, preventing malicious inline script execution and XSS attacks.
• Strict-Transport-Security (HSTS): Forces browsers to interact with your domain exclusively over encrypted HTTPS connections, guarding against SSL stripping.
• X-Frame-Options: Prevents your website pages from being embedded in iframes on malicious third-party domains, stopping clickjacking attempts.
• X-Content-Type-Options: Disables MIME-type sniffing by forcing browsers to adhere strictly to declared Content-Type headers.
• Referrer-Policy: Controls how much URL referrer information is shared when users navigate away from your site.
• Permissions-Policy: Limits browser feature access such as camera, microphone, geolocation, and payment APIs.

How to Use the Free Online Security Headers Auditor

You can audit any website or API endpoint security headers directly in your web browser:

1. Navigate to the Velona Security Headers Auditor Tool.
2. Enter the target domain or URL (for example, velona.in or github.com).
3. Click Audit Headers to send a stateless HTTP HEAD request.
4. Review the security letter grade, missing header warnings, raw response header dumps, and actionable remediation steps.

Like all utilities in Velona's developer fleet, queries process statelessly in memory without storing domain names or audit logs. You can use the tool completely anonymously, or log into your Free Velona Account to save recent execution history on your dashboard.

Programmatic API Access: Auditing Headers in Code

Need to automate security header checks in CI/CD build pipelines, automated test suites, or site health scripts? Velona provides a dedicated API endpoint (/tools/v1/security-headers).

Every registered user automatically receives a non-billable Developer Tools API Key on their API Keys Dashboard that requires zero wallet balance to use.

Example: Auditing Security Headers via cURL

curl -X POST https://velona.in/tools/v1/security-headers \
  -H "Authorization: Bearer YOUR_FREE_DEV_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://velona.in"}'

Example Response:

{
  "result": {
    "url": "https://velona.in",
    "grade": "A+",
    "score": 100,
    "present_headers": {
      "Strict-Transport-Security": "max-age=31536000; includeSubDomains",
      "X-Frame-Options": "DENY",
      "X-Content-Type-Options": "nosniff"
    },
    "missing_headers": []
  },
  "request_id": "req_b8c9d0e1f2a3"
}

Explore 49 Life Time Free Developer Utilities

The HTTP Security Headers Auditor is part of Velona's 49 Life Time Free Developer Tools Fleet, a complete suite of security, web, and infrastructure tools. Companion tools include:

• SSL / TLS Certificate Inspector: Inspect HTTPS certificate chains, SANs, and expiration warnings.
• DNS Propagation Checker: Test domain DNS record updates across 30 global resolvers.
• JWT Decoder & Inspector: Debug OAuth2 Bearer tokens and header claims safely.
• WHOIS & Domain Lookup: Inspect domain registrar details and creation dates.

Want to build AI automated applications alongside your web security tools? Try our Free Public Chat Playground, check real-time INR model rates on our Pricing Index, or sign up for a free Velona account to claim your free API key today!