UtilityKit

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HTTP Headers Checker

Inspect response status and headers from public HTTPS origins

About HTTP Headers Checker

HTTP Headers Checker performs a bounded fetch from UtilityKit's datacenter so you can read status lines, cache directives, and TLS-adjacent hints without exposing internal infrastructure to SSRF abuse. Paste any permitted public URL, follow redirects transparently, and copy the formatted header block straight into runbooks or vendor tickets.

Why use HTTP Headers Checker

  • Browser devtools hide cross-origin responses — this surfaces real headers safely.
  • Validate security headers like CSP or HSTS quickly.
  • See redirect chains without scripting curl yourself.

How to use HTTP Headers Checker

  1. Paste a fully qualified http(s) URL.
  2. Click Fetch — the API performs HEAD with GET fallback.
  3. Review final URL, timing, hop count, and sorted headers.

When to use HTTP Headers Checker

  • Confirming HSTS or CSP after CDN rule pushes.
  • Debugging stale caches reported by customers.
  • Teaching juniors how redirect loops surface over the wire.

Frequently Asked Questions

Can I probe internal IPs?

No — localhost, RFC1918 ranges, and similar destinations are blocked.

Does it execute JavaScript?

No — this inspects HTTP responses only, not rendered DOM.

Why mention hops?

Redirects are followed up to a capped depth so you know what the client ultimately receives.

Will POST bodies run?

Only safe retrieval verbs are used — no arbitrary POST passthrough.

Is the Headers Checker free?

Yes — UtilityKit does not charge for diagnostics.

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