sinikoding

HTTP Header Checker

net

Inspect the response headers of any URL, including security headers.

Through the API
curl -X POST https://sinikoding.dev/api/v1/http-headers \
  -H 'content-type: application/json' \
  -H 'x-api-key: tk_live_…' \
  -d '{"url":"…"}'

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This tool makes an outbound network call. It stays free on this page.