HTTP Headers Checker

Fetch response headers for a URL using HEAD requests.

HTTP Headers Checker fetches response headers from a URL so caching, content, redirect, and security behavior can be inspected. HTTP headers are metadata sent before the response body; they tell clients how to interpret, cache, protect, or route the resource. `Content-Type` declares the media type, `Cache-Control` governs browser and CDN caching, redirect headers guide navigation, and security headers such as HSTS, CSP, and frame restrictions reduce common attack surfaces. Header behavior can differ by CDN, origin, environment, user agent, or redirect path. This tool is useful during deploy verification and incident triage, but full diagnosis may require checking the final URL, intermediate redirects, and CDN configuration.