Every request your browser makes includes a bundle of headers: which languages you prefer, which browser you're on, which page you came from, and more. This tool shows the headers our server received from your request, with explanations. Nothing is stored.
Known headers are highlighted and explained in the second column.
| Header | Value / What it means |
|---|
HTTP headers are how browsers and servers negotiate a request. Most are harmless (what compression to use, which file types to accept). But combined, they leak a lot about who you are:
sec-ch-ua-*) — precise browser brand, version, platform, mobility.Do you log my headers?
No. The endpoint reads your incoming headers and returns them to you. We don't persist them. See our Privacy Policy.
Why do I see x-vercel-ip-* headers?
The backend runs on Vercel. Vercel adds these headers server-side based on your IP so we can respond without a geo-IP library. They were not sent by your browser.
Can I inspect headers on any site?
Yes — open DevTools → Network → select a request. This page is a quick, shareable UI when devtools aren't convenient.