HeoLab

HTTP Header Viewer

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Fetches and displays all HTTP request headers your browser sends to the server. See every header your browser transmits: User-Agent, Accept-Language, Accept-Encoding, DNT, Sec-Fetch-*, cookies, and more. Useful for debugging web requests, understanding browser fingerprinting, and API development.

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Common Use Cases

  • Inspect headers sent by your browser
  • Debug authentication header issues
  • Understand browser fingerprinting
  • Verify CORS preflight headers

Frequently Asked Questions

Why can't I see response headers?

This tool shows request headers — the headers your browser sends TO the server. Response headers (what the server sends back) can be viewed in your browser's DevTools under Network → select a request → Headers.

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Tool Info

CategorynetworkAI EnhancementNoData StorageZero retention