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HTTP Header Parser

Parse raw HTTP headers while preserving duplicate fields and reporting malformed lines.

HTTP Header Parser
Local input
Output
Processing…
Processed locally in your browserNo input history is saved
About this tool

Made for the task at hand.

Inspect copied request or response headers without flattening repeated fields such as Set-Cookie. Basic syntax problems are listed separately.

How to use

  1. Paste raw headers, optionally including the status line.
  2. Review lowercase field names and arrays of values.
  3. Check warnings for malformed or obsolete folded lines.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
Why are header values arrays?

A field may occur more than once. Arrays preserve every occurrence instead of overwriting earlier values.

Are cookies parsed into attributes?

No. This tool parses the header envelope and deliberately keeps Set-Cookie values intact.

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