Visor de Cabeceras HTTP
Fetch a URL and inspect its response headers
100% gratis. Esta herramienta necesita nuestro servidor para hacer el trabajo, así que lo que envías se procesa allí y luego se descarta: nunca se almacena.
Enter a URL above and click Inspect to view its response headers.
Acerca de esta herramienta
Fetch a URL and displays exactly what HTTP response headers it returns - useful for debugging caching behavior, checking security headers, verifying redirects, or understanding how a server is configured to respond, without needing browser developer tools open.
Cómo usar esta herramienta
- Enter the target URLPaste the full public URL you want to inspect, including protocol (https://).
- Fetch response headersRun the request and capture the server-returned header set.
- Review key header groupsCheck caching, security, content, and redirect-related headers in one view.
- Compare after config changesRe-run after server updates to confirm headers are deployed correctly.
Por qué usarla
- Quickly validates real response headers without opening browser devtools.
- Useful for SEO, performance, and security checks from one endpoint call.
- Helps detect CDN/cache misconfiguration early.
- Supports faster verification during deployment troubleshooting.
Usos comunes
- Checking Cache-Control and ETag behavior after release.
- Verifying security headers like CSP, HSTS, and X-Frame-Options.
- Debugging redirect chains and canonical URL responses.
- Auditing API response headers for cross-team integration readiness.
Consejos para mejores resultados
- Always test both `www` and non-`www` variants if your site uses redirects.
- Compare headers across staging and production to catch drift.
- Validate that cache headers match asset type and update frequency.
- Use HTTPS endpoints for meaningful security-header audits.
Errores a evitar
- Assuming browser-cached results reflect current server configuration.
- Checking only status code and ignoring missing security headers.
- Auditing one route while other templates return different headers.
- Confusing proxy/CDN headers with your application-level headers.
Preguntas frecuentes
Common ones include Content-Type, Cache-Control, Set-Cookie, security headers like Content-Security-Policy, and server information - exactly what the target server chooses to send back.
Publicly accessible URLs generally work; some servers may block requests that don't look like they're coming from a real browser, which could affect what headers you see.
Common reasons: debugging why caching isn't working as expected, verifying security headers are configured correctly, or understanding a redirect chain when a URL doesn't go where you expect.
Yes. Http Header Viewer is free for normal use with no account required, and ToolBox does not add a watermark to your result.
Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.
No install needed. Open Http Header Viewer in your browser, add your file or paste your input, then download or copy the result.
Yes on modern mobile browsers. For large files, a desktop browser is usually faster and more reliable.
Try a different quality or format setting, use a smaller input, or open a related tool (for example compress before convert). Keep a copy of the original file before replacing it.
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