Check a URL

Enter a URL to inspect its HTTP security headers. Results are returned from a single server-side request.

Platform limitation: Headergrade runs on Cloudflare Workers. Targets behind Cloudflare may report as unreachable — Cloudflare does not allow a Worker to open a TCP socket to a host also on Cloudflare. This is a platform limit, not a result about the target's own configuration.
Target
Status
Final URL
Redirects