Developer Tools
HTTP Headers Decoder
🔒 Runs in your browser
Paste HTTP response headers to decode and understand each one. Covers security, caching, CORS and content headers.
How to use this tool
- Paste raw HTTP response headers into the input field.
- Review each header's plain-English explanation in the output panel.
- Click any header name to expand security and caching notes.
Frequently Asked Questions
- Are the HTTP headers I paste processed on brevio's servers?
- No. Parsing and explanation happen entirely in your browser. Paste freely — none of it is transmitted.
- What does the tool do with raw HTTP response headers?
- It parses each header field and displays a plain-English explanation of its purpose, common values, and security implications where relevant.
- Can I use this to understand security-related headers like Content-Security-Policy?
- Yes. Headers such as Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options are annotated with what they control and why they matter.
HTTP Headers Explained: How to Read Response Headers Like a Pro
What each HTTP response header does: security headers (HSTS, CSP, X-Frame-Options), caching (Cache-Control, ETag), CORS, and content headers explained.