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HTTP Header Checker

Inspect HTTP response headers from any URL. Check security headers (HSTS, CSP, X-Frame-Options), caching, content type, server info and more.

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Important Headers to Check

  • Strict-Transport-Security (HSTS) — Forces HTTPS
  • Content-Security-Policy — Prevents XSS attacks
  • X-Frame-Options — Prevents clickjacking
  • X-Content-Type-Options: nosniff — Prevents MIME-type sniffing
  • Cache-Control — Tells browsers how to cache resources
  • Referrer-Policy — Controls referrer info sent

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