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🖥️ HTTP Header Analyzer

Analyze HTTP response headers for security vulnerabilities. Get an A–F security grade, detect the technology stack, audit HTTPS enforcement, and compare two URLs side by side.

HTTP Security Headers Guide

HTTP response headers are instructions your web server sends to the browser. Security headers prevent a broad range of attacks — from cross-site scripting (XSS) and clickjacking to MIME sniffing and protocol downgrade attacks. Sites that score an "F" are missing critical protections that can be added with a single line of server config.

HSTS (HTTP Strict Transport Security) prevents SSL stripping attacks by telling browsers to always use HTTPS. A max-age of at least 1 year (31536000 seconds) is recommended. CSP is the most powerful header — it can completely prevent XSS if configured correctly.

Grade HTTP Security Headers and Get Step-by-Step Configuration Remediation

HTTP Header Analyzer audits the security headers returned by any web server and produces a graded report (A+ to F) with specific configuration recommendations for each header. Security headers are the web's defense layer against a class of attacks that plague modern applications: cross-site scripting (XSS), clickjacking, protocol downgrade attacks, MIME type confusion, and information disclosure.

A missing Content-Security-Policy header leaves a site vulnerable to XSS attacks that could steal session cookies and impersonate users. A missing X-Frame-Options header enables clickjacking — embedding a site in an invisible iframe to trick users into clicking malicious elements. A missing HSTS header allows network-level attackers to downgrade HTTPS connections to plain HTTP. The tool explains each risk in actionable terms.

The remediation panel provides copy-paste ready header configurations tailored to the site's existing setup. For each missing or misconfigured header, you get the exact header name, recommended value, and an explanation of why that value is appropriate — ready to drop into your Nginx, Apache, or application framework configuration.

⚡ How to Use

  1. 1Enter the URL of the website to analyze (include https://).
  2. 2Click "Analyze Headers" — results appear within a few seconds.
  3. 3Review the overall grade at the top — anything below B warrants attention.
  4. 4Click each header row to expand the detailed finding and remediation steps.
  5. 5Copy the recommended header value directly from the remediation panel.

🎯 Who Uses This

  • ▸Web developers ensuring their sites follow security header best practices
  • ▸Security engineers conducting web application security assessments
  • ▸DevOps teams verifying security header configuration after deployments
  • ▸Compliance teams auditing websites against PCI-DSS, HIPAA, and GDPR requirements
  • ▸Bug bounty hunters identifying misconfigured security headers as vulnerability findings

Frequently Asked Questions

Q: What is the most important security header?
Content-Security-Policy (CSP) is generally considered the most impactful security header, as a strong CSP can prevent XSS attacks even when injection vulnerabilities exist in the application. However, it is also the most complex to configure correctly. Strict-Transport-Security (HSTS) comes a close second for any HTTPS-enabled site.
Q: Will adding security headers break my website?
Misconfigured headers can break functionality. CSP in particular requires careful configuration to avoid blocking legitimate scripts, styles, and resources. We recommend starting with report-only mode for CSP before enforcing. The other headers (X-Frame-Options, X-Content-Type-Options, Referrer-Policy) are safe to add without prior testing.