HTTP Headers Analyzer
Parse and explain raw HTTP response headers.
Processed locally in your browser. Nothing you enter is uploaded or stored.
Overview
Parses raw HTTP response headers and explains what each common one does — useful for debugging caching, CORS or security header issues.
How to use it
- 1Paste raw response headers, one per line (as shown by your browser's network tab).
- 2Each recognized header is explained below it.
Tips
- This explains headers you paste in — it doesn't fetch a live URL, since cross-origin header inspection from a browser is blocked by CORS for most sites.