HTTP Header Inspector

Paste a block of HTTP response or request headers and get a per-line parse, a security lint, and a quick-lookup of any header by name. Or browse the curated catalogue of 75+ standard, vendor, and deprecated headers. Everything runs in your browser — no upload, no tracking.

Security lint

Paste headers above to see the security report.

Parsed headers

No headers yet.

Type something above, or click a row below.

Catalogue —