Developer Tools

HTTP Header Viewer

Shows the live request summary, raw user-agent, client hints, detected IP chain, and screen/viewport signals from your current browser session.

The HTTP Header Viewer helps you see what your browser actually sends to the server without opening an external proxy or packet inspection tool.

Live request data is captured from your current browser session.

What stands out in HTTP Header Viewer

  • Live capture of request summary, user-agent, proxy-aware IP details, and screen/viewport signals
  • Side-by-side view of observed request hints and browser API hints when supported
  • Safe rendering that masks secret-bearing headers such as cookies and authorization values

Using HTTP Header Viewer, step by step

  1. Refresh the live snapshot

    Trigger a fresh server-side capture from your current browser session.

  2. Inspect the summary panels

    Review browser, client hint, IP, and screen/viewport summaries to understand the current session.

  3. Compare live viewport signals

    Check layout viewport, visual viewport, and ratio values, then export the masked JSON snapshot into debugging notes if needed.

When HTTP Header Viewer fits best

  • Checking reverse proxy forwarding behavior during local or production debugging
  • Comparing raw user-agent strings with client hints in modern browsers
  • Checking how screen, viewport, and scale signals vary across devices and sessions

Why is a live header viewer more useful than a static example?

Because the exact header and IP set can change by browser, proxy layer, device type, and network path. A live capture shows what this session is really sending right now.

HTTP Header Viewer: common questions

Does the tool store my headers or IP data?

No. The viewer captures the current request, renders the result, and does not keep a durable copy of the snapshot.

Why are some headers masked instead of fully shown?

Secret-bearing fields such as cookie and authorization values are masked so credentials are not exposed in the page UI or copied exports.

Can the detected IP differ from my local network address?

Yes. This tool shows the visitor IP chain carried with the request that reaches the application, which is usually a public or forwarded address after reverse proxies or edge layers.

Where to go after HTTP Header Viewer

Developer Tools category includes related tools and follow-up pages worth checking next.

HTTP Header Viewer

What You Can Inspect

  • User-Agent and Client Hints: Compare the legacy user-agent string with newer browser hint surfaces.
  • IP chain summary: Check the resolved client IP, proxy chain, and which forwarding header supplied it.
  • Screen and viewport signals: Review screen resolution, layout/visual viewport size, and scaling ratios in one panel.

Why Are Some Fields Masked?

Headers such as cookies and authorization tokens can contain secrets. This viewer keeps exported JSON snapshots safe by masking sensitive fields before they are copied out of the browser UI.