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About this tool
The HTTP Header Inspector shows all response headers of a URL and the full redirect chain (301, 302, 307...) to the final destination. Perfect for debugging cache, cookies, CORS, content types and redirect loops.
- Follow the whole redirect chain and spot loops or unnecessary hops.
- Review cache headers (Cache-Control, ETag) and server headers.
- Check cookies, CORS and content type of any endpoint.
Frequently asked questions
What are HTTP headers useful for?
To diagnose why a resource is not cached, why CORS fails, which server responds, or why a URL redirects where it should not. Headers tell you almost everything about a site's behavior.
Why does my URL show several redirects?
It is common to chain http to https and then to www or the non-trailing-slash version. Too many hops slow down loading and hurt SEO; ideally there is a single redirect to the canonical destination.