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HTTP Header Analyzer

Runs on our server

Security headers, compression, protocol, redirects, cookies and caching — all in one.

From a single server request: security headers with a grade, compression (Brotli/Gzip), HTTP version and HTTP/3 support, the redirect chain, cookies, caching, and all raw headers. HTTP/3 is detected via the Alt-Svc header (advertised, not an actual handshake).