Security Headers Scanner

Conduct a deep-dive audit of your web server's security configuration and defensive headers.

The Definitive Guide to HTTP Security Headers: Hardening Your Web Infrastructure

In the modern landscape of cybersecurity, a website's security is no longer just about having a strong password or an SSL certificate. True defense-in-depth requires hardening the communication channel between the web server and the user's browser. This is achieved through HTTP Security Headers. These headers are a subset of HTTP response headers that tell the browser how to behave when interacting with your site, effectively providing a set of "security instructions" that can block entire classes of common web attacks. Our Professional Security Headers Scanner is designed to perform a comprehensive audit of these instructions, helping you identify vulnerabilities and implement industry-standard best practices.

What Exactly are Security Headers?

When a browser requests a page from your server, the server responds with the content of the page and a set of HTTP Response Headers. While some headers provide basic information like content type or server version (which you can inspect with our HTTP Header tool), security headers are specifically designed to enable browser-side security features.

By correctly configuring these headers, you can protect your users from Cross-Site Scripting (XSS), Clickjacking, Code Injection, and "Man-in-the-middle" attacks. If you are unsure of your server's current IP or ownership, use our IP Lookup and WHOIS tools to verify your infrastructure details.

Deep Dive into Essential Security Headers

Our scanner audits the most critical headers defined by modern security standards:

  • Content Security Policy (CSP): Perhaps the most powerful security header. CSP tells the browser which sources of content (scripts, styles, images) are trusted. It is the primary defense against XSS attacks.
  • Strict-Transport-Security (HSTS): Forces the browser to only communicate with your server over encrypted HTTPS connections, preventing "SSL Stripping" attacks.
  • X-Frame-Options: Tells the browser whether your site is allowed to be embedded in an