HTTP Headers Checker
Check the HTTP response headers of any URL. Analyze security headers, caching policy, server information, and more.Updated 2026-03-16
🔒 Security Headers Checklist
These HTTP security headers are recommended for all websites:
How to Check HTTP Headers
- Enter a URL — Type or paste any website URL (e.g., https://example.com).
- Click Check Headers — The tool will fetch the HTTP response headers from the server.
- Analyze results — Review all headers, security score, and recommendations for missing security headers.
Headers are fetched via a CORS proxy. The actual HTTP request is made server-side to show all response headers accurately.
What Are HTTP Headers?
HTTP headers are metadata sent between your browser and a web server with every request and response. They contain important information about:
- Content — What type of data is being sent (HTML, JSON, images)
- Caching — How long the browser should cache the response
- Security — Rules to prevent XSS, clickjacking, and other attacks
- Authentication — Cookies, tokens, and authorization info
- Server — What software powers the website
Checking HTTP headers helps developers debug issues, security researchers find vulnerabilities, and SEO professionals optimize websites.
Frequently Asked Questions
Is this HTTP headers checker free?
Yes, completely free. No signup required. Check unlimited URLs.
What security headers should my website have?
At minimum: Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), X-Content-Type-Options, X-Frame-Options, and Referrer-Policy. These protect against common web attacks.
Why are some headers missing?
Not all servers send all headers. Missing security headers often indicate that security best practices haven't been implemented. This tool highlights which important headers are missing.
What's the difference between request and response headers?
Request headers are sent by your browser to the server (e.g., User-Agent, Accept). Response headers are sent by the server back to your browser (e.g., Content-Type, Set-Cookie). This tool shows response headers.
Can I check headers for any website?
Yes, you can check headers for any publicly accessible website. The tool makes a standard HTTP request and displays the response headers.
How do HTTP headers affect SEO?
Headers like Cache-Control affect page speed (a ranking factor), X-Robots-Tag controls indexing, canonical headers prevent duplicate content, and HSTS ensures HTTPS (preferred by search engines).
"HTTP Headers Checker." NetTool, nettool1.com, https://nettool1.com/tools/http-headers-checker/. Accessed 2026-03-16.