HTTP Header Analyzer — Security & CORS Audit
Parse and analyze HTTP request or response headers. Identifies categories, explains each header, flags missing security headers, and detects duplicates or suspicious values — entirely in your browser.
How to Use HTTP Header Analyzer — Security & CORS Audit
How to Use the HTTP Header Analyzer
Step 1: Paste Your Headers
Paste raw HTTP headers (one Header-Name: value per line) into the input field. You can paste:
- Request headers copied from browser DevTools → Network → Headers tab
- Response headers from curl output (
curl -I https://example.com) - Headers from API testing tools like Postman or Insomnia
- Any
Key: Valueblock of header lines
Step 2: Review the Results
The analyzer immediately shows:
- Parsed table — header name, category badge (authentication, content, caching, security, CORS, forwarding, custom), and value
- Header explanations — each known header includes a plain-English description
- Security check — lists any recommended security headers not found in the input
- Warnings — flags duplicate headers, missing cookie security attributes, exposed server versions, and wildcard CORS origins
Step 3: Export Results
Click Copy as JSON to copy the parsed headers as a JSON array, or Download JSON to save a full audit report including missing headers and summary statistics.
Header Categories
- Authentication — Authorization, Cookie, Set-Cookie, WWW-Authenticate
- Content — Content-Type, Accept, User-Agent, Host, Location
- Caching — Cache-Control, ETag, Vary, Expires, Age
- Security — CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Permissions-Policy
- CORS — Access-Control-Allow-Origin, Access-Control-Allow-Methods, Origin
- Forwarding — X-Forwarded-For, X-Forwarded-Proto, X-Real-IP
- Custom — Non-standard headers (X-Request-ID, X-API-Version, etc.)
Recommended Security Headers Checked
- Strict-Transport-Security — forces HTTPS within the max-age window (HSTS)
- Content-Security-Policy — restricts resource sources to prevent XSS
- X-Frame-Options — prevents clickjacking by blocking iframe embedding
- X-Content-Type-Options — stops MIME-type sniffing
- Referrer-Policy — controls how much referrer information is shared
- Permissions-Policy — restricts browser feature access (camera, mic, geolocation)
Frequently Asked Questions
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