HTTP Headers Inspector for Security

Why HTTP headers matter

HTTP headers tell browsers, crawlers, security tools, and performance systems how a page should be handled. They can affect caching, redirects, content type, framing protection, cross-origin behavior, referrer handling, and HTTPS enforcement. A missing or incorrect header can create security risk, broken assets, cache problems, or confusing crawl behavior even when the visible page appears normal.

Common header inspection use cases

Use this inspector when checking HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Cache-Control, CORS headers, server headers, and redirect-related responses. It is helpful after editing .htaccess rules, changing hosting, adding Cloudflare, fixing MIME-type errors, troubleshooting blocked CSS or JavaScript, or reviewing whether a site has basic security headers in place.

What to check next

After inspecting headers, run the SSL Certificate Checker, Redirect Checker, Page Size Checker, and Website Speed Test. Security headers are only one part of the full technical picture. SSL trust, redirect efficiency, page weight, and caching behavior should all be reviewed together when preparing a production website.