Your files stay on your device

Live HTTP Header Fetch

Fetch a URL's response headers through the capped proxy, order kept, custom User-Agent.
Fetch headersURL

Method (proxy allowlist)
GETHEADOPTIONSCustom User-Agent (optional)

Forbidden on browser fetches: this is why the proxy exists.

Browser egress

The request leaves from this project's proxy server (GET/HEAD/OPTIONS only, public hosts only, capped size and time, rate-limited), not straight from your browser, because cross-origin response headers and a custom User-Agent are unreadable/unsettable there. This page leaves your browser only when you press the button; never on load, never in the background. Nothing is sent anywhere else, and no analytics loads on this page.

Live response headers with order and duplicates preserved (each Set-Cookie its own row). Redirects are not followed. A 3xx shows its Location. For paste-in transcripts, use the header parser tool.
Nothing in yet

Paste, drop, or type to begin. Everything stays on this device.

Next door in Network

- CORS probe (/network/cors)
- HTTP Header Parser (/web/headers)
All network tools (/network)

Canonical HTML: https://nutter.tools/network/headers
Markdown version: https://nutter.tools/network/headers/index.md
Plain-text version: https://nutter.tools/network/headers/index.txt
Agent index: https://nutter.tools/llms.txt