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HTTP header inspector

Every response header for a URL, with the security and caching headers explained. Free, no sign-up.

Answers: http header checker · check security headers · see response headers online

Read the step-by-step guide · Blog workflow

What this does not measure

  • It shows one response from one location. A CDN may serve a different set of headers to a different region.
  • HSTS and CSP are reported as present or absent, not graded. Whether a policy is appropriate for your site depends on what your site does.
  • Header names and values are shown as sent. It does not interpret a vendor-specific header it does not recognise.

Every response header for one URL, with the security and caching ones explained. Headers are reported as present or absent, never graded.