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HTTP Security Headers Tool

Build hardened security header policies or audit existing server responses with instant configuration export for Nginx, Apache, and Vercel.

Security Posture Preset:

Forces browsers to connect via HTTPS only.

Prevents your site from being embedded inside an iframe on malicious sites.

Prevents browsers from MIME-sniffing a response away from declared content-type.

Controls how much referrer information is sent along with outbound requests.

Disables sensitive browser APIs and hardware features from being accessed by scripts or embedded iframes.

Mitigates XSS and data injection attacks by restricting origins of scripts, styles, and assets.

Generated Server Configurations
Overall Security Grade

A+

All major defensive headers are configured.

0
Passed
0
Missing
Header Evaluation Breakdown

What are HTTP Security Response Headers?

HTTP Security Response Headers are specialized HTTP metadata fields returned by web servers that instruct modern browsers to enforce strict client-side defensive boundaries. By correctly implementing these headers, website owners can harden their web applications against clickjacking, cross-site scripting (XSS), cross-site leaks, SSL stripping, and malicious content sniffing without touching their core application code.

Key Capabilities & Features

  • OWASP Best Practices: Built-in templates following the official OWASP Secure Headers Project standards.
  • Multi-Server Export: Instant generation for Nginx (add_header), Apache (.htaccess), Vercel/Next.js JSON, and Node.js Express.
  • Instant Security Auditor: Evaluates your live or copied HTTP response headers and produces an instant A+ to F grade with specific remediation snippets.
  • Comprehensive Coverage: Controls CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy.

Step-by-Step How It Works

  1. Choose a preset (Balanced or Strict) or toggle individual security headers according to your site's architecture.
  2. Select your server format (Nginx, Apache, or Vercel).
  3. Copy the configuration snippet and paste it directly into your virtual host or server config.
  4. Audit & verify your production response headers in the Auditor tab to verify an A+ grade.

Frequently Asked Questions

HSTS Preloading registers your domain directly into the hardcoded list shipped with Chrome, Firefox, and Safari. Once preloaded, the browser will refuse to connect over insecure HTTP, even on the very first visit. You must ensure you have valid HTTPS and working certificates across all subdomains before submitting to the preload list.

Yes, if third-party scripts (like Google Analytics, Stripe, or Facebook Pixels) are not explicitly allowed in your CSP directives (such as script-src or connect-src), the browser will block them. We recommend testing CSP in report-only mode (Content-Security-Policy-Report-Only) before enforcing it in production.

Older browsers utilized an experimental reflective XSS filter controlled via X-XSS-Protection: 1; mode=block. Security researchers discovered that this filter actually introduced side-channel vulnerabilities and information leaks. Modern web standards deprecate it in favor of a strong Content-Security-Policy (CSP).
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