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Parse and analyze HTTP response headers.
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HTTP Header Parser turns a raw, hard-to-read block of HTTP headers into a clean list of name/value pairs, making it fast to inspect the metadata that controls how requests and responses behave.
Headers carry the rules behind web traffic, content type, caching, cookies, authentication, CORS, and security policies, so they're where a huge share of web debugging happens. But raw header dumps from curl, logs, or dev tools are dense and run-together, and parsing them into structure is what lets you quickly find the single header behind a caching miss, a blocked CORS request, or a security misconfiguration.
Which headers matter depends on the issue: Cache-Control and ETag for caching, Access-Control-Allow-* for CORS, Content-Type for body handling, Set-Cookie for sessions, and policies like HSTS and Content-Security-Policy for security. A clean view makes whichever you're chasing easy to spot.
Parsing runs entirely in your browser, so headers, which often include cookies and tokens, never leave your device, though you should still handle real credentials carefully. Pair it with the API Request Tester to inspect the headers a live endpoint actually returns.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Developer Tools |
Paste a raw HTTP header block
The parser splits it into name/value pairs
Review the cleanly formatted list
Use it to debug or document the request/response
Parses raw HTTP headers into a clean, readable list
Separates header names and values for easy scanning
Helps debug requests, responses, caching, security, and CORS headers
Handles pasted raw header blocks from tools and logs
Runs in your browser, your headers are never uploaded
Free, with no signup and no rate limit
Reading a raw response header block from curl, logs, or dev tools
Debugging caching, CORS, or security headers on a request
Inspecting which headers a server is sending
Learning what specific HTTP headers mean and do
Be cautious pasting real headers that contain cookies or auth tokens, though parsing here is local, treat credentials carefully
For caching issues, zero in on Cache-Control, ETag, and Expires; for CORS, the Access-Control-Allow-* headers
Use it alongside the API Request Tester to inspect the headers a live request actually returns
Common questions about this tool, its workflow, and what to expect before you use it.
IETF
Defines the standard HTTP header fields and what each one means.
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Parse and analyze HTTP response headers.
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