◉ Developer Tool
HTTP Headers Checker
View all HTTP response headers for any URL — status code, server type, security headers, cache settings and more.
Important HTTP Headers Explained
Content-Type
Tells the browser what type of content is being sent — HTML, JSON, image, etc. Required for correct rendering.
Cache-Control
Controls caching behavior. max-age sets cache lifetime. no-store disables caching entirely.
Strict-Transport-Security
HSTS — forces HTTPS. Browsers won't connect over HTTP once this header is seen.
Content-Security-Policy
CSP — restricts which resources the browser can load. Critical for preventing XSS attacks.
X-Frame-Options
Prevents your site from being embedded in iframes on other domains. Stops clickjacking.
Server
Identifies the server software (nginx, Apache, Cloudflare). Sometimes hidden for security.