❓ Frequently Asked Questions
❓ What is an HTTP headers checker used for?
HTTP headers checker helps web administrators, security engineers, and developers analyze website HTTP response headers. By inspecting security headers (CSP, HSTS, X-Frame-Options, etc.), you can evaluate security configurations and identify potential vulnerabilities.
❓ Does the tool actually visit the target website?
Yes. When you enter a URL and click check, the tool sends a GET request to the target via the fetch API and reads the response headers. Due to CORS restrictions, some websites may block cross-origin requests.
❓ What is Content-Security-Policy (CSP)?
CSP is a critical security mechanism that prevents XSS and clickjacking attacks. It uses a whitelist to tell the browser which sources of scripts, styles, and images are trusted. For example, 'script-src \'self\'' only allows same-origin JavaScript.
❓ What security headers should every website have?
Key security headers include: Content-Security-Policy (XSS prevention), Strict-Transport-Security (HTTPS enforcement), X-Frame-Options (clickjacking prevention), X-Content-Type-Options (MIME sniffing prevention), Referrer-Policy, Permissions-Policy, and Cache-Control.
❓ Why do some websites fail to check?
Common reasons: 1) CORS restrictions blocking cross-origin requests; 2) Target website is down; 3) Incorrect URL format (include protocol like https://). This is a normal browser security limitation.