HSTS checker

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HTTP Strict Transport Security (HSTS) is a security header that forces browsers to always connect via HTTPS, preventing protocol downgrade attacks and cookie hijacking. This tool checks if a site sends the Strict‑Transport‑Security header and validates its syntax, including the max‑age directive. Enabling HSTS is a best practice for any site that uses HTTPS. Use this checker to confirm your configuration or to audit third‑party sites.

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