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Security & Network

HTTP Header Checker

View any URL's HTTP response headers including security headers and caching

What is HTTP Header Checker?

An HTTP header checker sends a HEAD request to any URL and displays all response headers returned by the server. It audits security headers like Strict-Transport-Security, Content-Security-Policy and X-Content-Type-Options — essential for protecting your site against XSS, clickjacking and MIME-sniffing attacks.

How to Use HTTP Header Checker

  1. 1

    Enter a URL

    Type or paste any website URL. HTTPS is added automatically if omitted.

  2. 2

    Click Check

    We send a HEAD request and display all response headers.

  3. 3

    Review security audit

    See which security headers are present and which are missing.

  4. 4

    Copy results

    Copy all headers to share with your development team.

Features

  • View all HTTP response headers
  • Security header audit (9 key headers)
  • Highlights present vs missing headers
  • One-click copy all headers
  • HTTP status code display
  • Works with any public URL

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Frequently Asked Questions

What are security headers?+
Security headers are HTTP response headers that configure browser security features. Key ones include HSTS (forces HTTPS), CSP (prevents XSS), X-Frame-Options (prevents clickjacking) and X-Content-Type-Options (prevents MIME sniffing).
Why is a HEAD request used?+
HEAD requests fetch only the headers without downloading the full page body, making the check faster and using less bandwidth.
Can I check any URL?+
You can check any publicly accessible URL. Internal/localhost URLs are blocked for security.
What security headers should I have?+
At minimum: Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options (nosniff), X-Frame-Options and Referrer-Policy.