What are HTTP response headers?

HTTP headers are metadata sent by servers with each response. They control caching, security policies, content type and many browser behaviours.

What security headers should I have?

Key security headers include Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Strict-Transport-Security and Referrer-Policy.

Why check HTTP headers?

To audit server configuration, debug caching issues, verify security headers, and check CORS policies.

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Privacy Tool

HTTP Headers Checker

See all HTTP headers your browser sends with every request — and check response headers from any website.

Your Browser's Request Headers

These 11 headers are sent with every page you visit

Accept info

*/*

Accept-Encoding info

gzip, br, zstd, deflate

Connection

upgrade

Host

anonymiz.com

Https

Remote-Host

216.73.216.116

Upgrade

User-Agent leak

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

X-Forwarded-For info

216.73.216.116

X-Forwarded-Proto

https

X-Real-Ip

216.73.216.116

Check Response Headers of Any Website

Website URL

We fetch the response headers from this URL and display them — useful for security audits

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Done!

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