View HTTP response status and security headers returned by any web server.
Essential HTTP status response codes and recommended security headers for modern web applications.
| Header / Status | Category | Purpose & Best Practice |
|---|---|---|
| 200 OK | Success (2xx) | Request succeeded; content delivered. |
| 301 Moved Permanently | Redirection (3xx) | Permanent redirect; passes SEO value/link equity. |
| 403 Forbidden | Client Error (4xx) | Server refuses request (permissions/firewall block). |
| 404 Not Found | Client Error (4xx) | Requested resource does not exist on origin. |
| 500 Internal Error | Server Error (5xx) | Backend application crashed or threw unhandled exception. |
| 502 Bad Gateway | Server Error (5xx) | Reverse proxy failed to reach backend upstream server. |
| Strict-Transport-Security | Security Header | Enforces HTTPS-only browsing (HSTS) on domain. |
| Content-Security-Policy | Security Header | Prevents XSS attacks by restricting authorized script sources. |
| X-Frame-Options | Security Header | Prevents clickjacking by disabling iframe embedding. |
| X-Content-Type-Options | Security Header | Set to nosniff to prevent MIME type confusion exploits. |
View HTTP response status and security headers returned by any web server.
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