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HTTP headers parser

Paste request or response headers from devtools or curl. Parsing runs in your browser.

Runs locally — nothing is uploaded
Result
Paste raw HTTP headers.

How to use

  1. 1Copy headers from devtools (Network → request → Headers) or from curl -I / curl -v.
  2. 2Paste them and choose the output.
  3. 3Read the security checks for responses or copy the code for requests.

One point each for HSTS, a CSP without unsafe-inline or unsafe-eval for scripts, X-Content-Type-Options, framing protection, Referrer-Policy and Permissions-Policy: 6 is A, 5 B, 4 C, 3 D, fewer F.

Yes, including pseudo-headers like :authority and :path; they are used to rebuild the URL for curl.

Pseudo-headers and Content-Length are set by the HTTP client itself; sending them by hand breaks requests.

Infrastructure headaches?

Tell us about your stack — we reply within one business day.