HTTP Header Parser Online

Developer Utility

HTTP Header Parser

Raw Response Headers

1
2
3

content-type: text/html; charset=utf-8
cache-control: public, max-age=3600
x-frame-options: SAMEORIGIN

Supports status lines, folded continuation lines and copied browser or curl response headers.

2 header issues found

3 parsed headers.

Parsed3

Malformed0

Duplicates0

Security1

Cache1

Issues2

Header Checks

Parse header names and values, highlight duplicates and review common cache, content and security fields.

Ready

Content-Security-Policy is missing. Add one when reviewing production security headers.
X-Content-Type-Options is missing. Consider nosniff for production responses.

Header	Value	Category
content-type	text/html; charset=utf-8	Content
cache-control	public, max-age=3600	Cache
x-frame-options	SAMEORIGIN	Security

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What It Checks

Focus Areas for This Tool

These are the signals I would review manually when deciding what needs fixing first.

Header names

Review this area to understand whether it is helping or hurting growth.

Header values

Review this area to understand whether it is helping or hurting growth.

Duplicate headers

Review this area to understand whether it is helping or hurting growth.

Security and cache fields

Review this area to understand whether it is helping or hurting growth.

Optimization Guide

How This Tool Helps Before Publishing

A little context makes the numbers more useful. Use these notes to understand where this tool fits inside content, SEO and website reviews.

Clean up copied response headers

Paste headers from DevTools, curl or logs and turn them into a structured table that keeps status lines and continuation values readable.

Find duplicate or malformed lines

The parser flags repeated header names and lines that do not contain a valid header separator, so review reports are easier to trust.

Review cache and content signals

Quick category counts help you confirm whether Content-Type, Cache-Control, Vary and similar response fields are present before deployment.

Check security header coverage

Use the issue list to spot missing production security fields such as Content-Security-Policy and X-Content-Type-Options.

FAQs

Frequently Asked Questions

Quick answers about how this tool works and when to use it.

Yes. The parser accepts raw response headers from curl, browser network panels, HTTP clients and server logs.

No. It parses the pasted text locally in your browser and does not make network requests with your header data.

Some repeated headers are valid, but duplicates can also reveal accidental server configuration conflicts, so they are highlighted for review.

No. It checks presence and parse quality for common headers, but detailed policy review still needs manual testing.

Related Tools

HTTP Header Parser for Smarter Website Decisions