HTTP Header Analyzer

Online HTTP header analyzer supporting URL fetch and pasted headers to inspect security headers, CORS, and cache policy risks

URL mode sends a network request to the target address, while paste mode is analyzed locally in your browser.

Website URL

Detected HTTP Headers

No HTTP header data

Documentation

What is HTTP Header Analyzer

This tool analyzes HTTP response headers for security and caching quality, using either live URL fetch or manually pasted headers.

Key Features

Supports URL fetch mode and manual input mode.
Detects common security and cache header issues.
Provides reason codes, severity, and recommendations.
Outputs overall score with actionable findings.

Steps

Choose URL mode or manual mode.
Enter target URL or raw header text.
Run analysis and review score/result cards.
Improve server configuration based on recommendations.

FAQ

Why is the score low?

Usually because critical headers are missing, such as CSP, HSTS, or frame/content protections.

Why do manual and URL mode results differ?

Captured runtime headers may differ from pasted data, and proxies/CDNs can rewrite header fields.