Request Header Inspector

Server assisted API Testing

Instantly view your own browser's request headers (User-Agent, Accept, language, client hints) or capture headers from any client via a unique URL, with plain-language explanations.

Privacy: This tool sends the request through the Mutqan backend relay to reach the target. Only the target URL, headers and body you enter are transmitted, and nothing is stored.

How to use Request Header Inspector

  1. Open the tool — your browser headers load automatically.
  2. To inspect another client, create a capture URL and send a request from it.
  3. Select the captured request and read the Headers tab.

Request Header Inspector features

  • Shows your own browser request headers instantly, with a plain-language explanation for each
  • Capture headers sent by any other client through a unique URL
  • Headers grouped by purpose with meanings (User-Agent, Accept, Accept-Language, client hints, Sec-Fetch-*, cookies…)
  • Network headers added by the edge (cf-*, x-forwarded-*) identified separately
  • Copy all headers as text

Request Header Inspector example

Your browser headers

Input:

(automatic GET /api/v1/echo)

Output:

user-agent: Mozilla/5.0 … Chrome/128 — Identifies the browser and OS
accept-language: ar-SA,ar;q=0.9,en;q=0.8 — Preferred languages for content negotiation
sec-fetch-mode: cors — How the request was initiated

Frequently asked questions about Request Header Inspector

How do I see my own headers?

They load automatically at the top of the page through the echo endpoint, with an explanation for each header (User-Agent, Accept, language, client hints, Sec-Fetch-* and more).

How do I inspect headers from another client?

Create a capture URL and send a request from that client; select it in the list to see its headers, grouped and explained.

Why do I see Cloudflare or forwarding headers?

Requests pass through the edge network before reaching the server; cf-* and x-forwarded-* headers are added on the way and are shown under Network.