Header Parser
Parse raw HTTP headers into readable key and value pairs for request and response debugging.
What is Header Parser?
Turn copied HTTP headers into a readable name/value representation. Keep the request method, status line and body separate from header fields when preparing a sample.
How to use Header Parser?
Step 1
Paste raw header lines into the input panel.
Step 2
Review the parsed key and value output in the structured result area.
Step 3
Copy the normalized form or continue with the header analyzer.
Example input / output
Content-Type: application/json describes the representation. Authorization: Bearer REDACTED contains credentials, not a decoding instruction. Redact it before copying a header block.
Example input
Authorization: Bearer token
Content-Type: application/json
X-Trace-Id: 4f5d1e2a-3b44-4d65-9872-0ff13c1fa221Check the result
- Malformed lines without a colon cannot be parsed as standard headers.
- Multi-line or folded headers may require manual cleanup first.
Practical developer examples
Compare the actual hop
A reverse proxy can add, remove or rewrite headers. Compare browser response headers with gateway logs instead of assuming application code produced every field.
Preserve repeated fields
Repeated Set-Cookie fields have distinct meanings. A map or joined display may not preserve all HTTP repetition semantics; retain the original block for an exact comparison.
Common developer use cases
This is a text parser, not a full HTTP protocol validator. Header values may contain additional colons; do not split them manually at every colon.
Common issues
FAQ
Are header names case sensitive?
HTTP field names are case insensitive. A difference in casing alone is not a different header.
Can parsing explain a CORS failure?
It helps inspect access-control headers. The browser console, origin, preflight and credentials policy are needed to diagnose the failure.