About this tool
Run curl -sIL https://example.com in a terminal, or copy the response headers from your browser's Network tab, and paste them here. The checker follows each response in a redirect chain and explains status codes, caching and missing security headers.
How to use it
- In a terminal, run curl -sIL followed by your URL, or copy the response headers from your browser's Network tab.
- Paste the output into the box.
- Review the redirect chain and the checks for security, caching and compression.
Questions
How do I get a page's response headers?
In a terminal run curl -sIL followed by the URL; -I fetches headers only and -L follows redirects. In Chrome, open DevTools, go to Network, click the page request and copy the response headers.
Should I use a 301 or 302 redirect?
Use 301 (or 308) for a permanent move so search engines pass signals to the new URL. Use 302 or 307 only for genuinely temporary moves.
Which security headers matter most?
Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options: nosniff, a Referrer-Policy and frame protection through CSP frame-ancestors or X-Frame-Options.
Last reviewed 16 October 2026.
