HTTP Header Parser

Inspect an optional HTTP start line plus header fields locally without making a network request.

HTTP start line + headers, or headers only

—Header lines

—Unique names

—Repeated names

—Errors

ReadyRepeated field names are preserved as arrays; this parser does not fetch a URL.

How to use this HTTP Header Parser

Parse request or response header blocks while preserving repeated field names and reporting malformed lines. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.