Headers Analyzer: Security Audit

Check any website's HTTP response headers instantly. Detect missing security protocols like CSP and HSTS to protect your users from attacks.

AI Overview

An HTTP Headers Analyzer inspects the invisible metadata sent by a web server. It identifies security vulnerabilities, tracks status codes (200, 301, 404), and reveals server software. Setting correct headers is essential for PCI compliance and preventing XSS or Clickjacking attacks.

Why HTTP Headers Matter for Security

HTTP Headers are the background signals that tell your browser how to behave. While most users never see them, they are the first line of defense against hackers. For example, a Content Security Policy (CSP) prevents malicious scripts from running, while HSTS ensures your connection never drops down to an insecure HTTP level.

Pro Tip: If your Server header reveals your software version (e.g., nginx/1.18.0), you are giving attackers a roadmap to find specific exploits for that version. Always hide your server signature.

Essential Security Headers for 2026

  • HSTS: Forces the browser to use HTTPS only, stopping man-in-the-middle attacks.
  • CSP: The most effective way to block Cross-Site Scripting (XSS).
  • X-Frame-Options: Prevents your site from being used in "Clickjacking" overlays.
  • X-Content-Type-Options: Stops the browser from "guessing" file types, which can lead to code execution.

How to Check Your Browser's Outgoing Headers

Every request your browser makes includes request headers. These identify your User-Agent, preferred language, and DNT (Do Not Track) settings. On ZKB Tracking, we help you see these outgoing signals to understand your digital fingerprint better.

Frequently Asked Questions

What is a 301 redirect?
A 301 status code means a page has moved permanently. This is the best method for SEO when changing URLs.

What does "MIME-sniffing" mean?
It is a browser behavior where it tries to guess a file's format. Hackers abuse this to trick browsers into running malicious code hidden in safe files.

Is it free to audit any URL?
Yes. You can use our online header lookup tool to scan any website's public security posture without an account.