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HTTP Header Analyzer

Parse and analyze HTTP response headers for security issues. Check CSP, HSTS, and more — locally in your browser.

HTTP Header Analyzer
Parse and grade HTTP security headers locally. No data sent to any server.
Ctrl+Enter AnalyzeSecurity grade
Paste HTTP HeadersRaw response headers
Analysis ReportSecurity grade
ReadyBrowser only
Paste HTTP response headers to analyze security configuration.

How ZeroData protects your privacy

  • ✓ No Uploads: Tool input is processed in your browser and is not sent to ZeroData servers.
  • ✓ No Storage: Tool input is not saved by this website.
  • ✓ No Input Tracking: Analytics never receive the text, files, keys, or credentials you process.
  • ✓ Verifiable: Disconnect from the network after the page loads; local tool processing continues without uploading your input.

How to Use the HTTP Header Analyzer

  1. Copy the HTTP response headers from your browser's DevTools (Network tab).
  2. Paste the raw headers into the input editor.
  3. Click Analyze Headers to run the security check.
  4. Review the grade and fix any missing security headers on your server.

Common Use Cases

  • Auditing server responses for missing or misconfigured security headers.
  • Debugging Cross-Origin Resource Sharing (CORS) configuration issues.
  • Parsing and formatting raw curl response logs for easier reading.
  • Verifying Cache-Control and ETag directives for CDN optimizations.
  • Extracting and inspecting Set-Cookie attributes for secure session management.

Frequently Asked Questions

Does this tool make actual HTTP requests?

No, it parses raw text headers that you paste from tools like curl, Postman, or browser dev tools.

Can it analyze both request and response headers?

Yes, it can parse any valid HTTP header block, regardless of whether it originated from a client request or a server response.

Are my authorization tokens safe?

Yes. Because the tool runs entirely locally in your browser, your sensitive tokens and cookies are never sent to our servers.

Why are security headers important?

Headers like CSP and HSTS protect users from common vulnerabilities like Cross-Site Scripting (XSS) and man-in-the-middle attacks.

Can it handle multiline headers?

The parser is designed to handle standard HTTP header formatting, including correctly indented multiline values.

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