Security Headers Analyzer
Instantly inspect the HTTP response headers of any domain. Verify the implementation of critical security policies.
Understanding HTTP Security Headers
When a browser requests a page from a web server, the server responds with the content along with HTTP response headers. These headers contain metadata about the response. Security Headers are a subset of these responses specifically designed to instruct the browser on how to behave securely when handling your application's data.
Failing to configure these headers properly leaves your application vulnerable to a wide array of client-side attacks, including Cross-Site Scripting (XSS), Clickjacking, MIME-sniffing, and Man-in-the-Middle (MitM) attacks. Modern DevSecOps pipelines consider the presence of headers like Content-Security-Policy (CSP) and Strict-Transport-Security (HSTS) as mandatory compliance benchmarks for enterprise environments.
The Critical Defense Layers
- Content-Security-Policy (CSP): Perhaps the most complex and critical header. It acts as an allowlist, dictating exactly which domains the browser is permitted to load scripts, styles, and images from. This neutralizes unauthorized injected scripts.
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Strict-Transport-Security (HSTS): Forces all browser communication to occur over HTTPS. Even if a user types
http://in the address bar, the browser will upgrade the connection internally before any network traffic is generated. - X-Frame-Options: Ensures your website cannot be embedded into an iframe on a malicious site, protecting users from being tricked into clicking invisible buttons (Clickjacking).
Architectural Note & Privacy
Unlike standard frontend utilities, analyzing HTTP headers requires bypassing Cross-Origin Resource Sharing (CORS) restrictions enforced by web browsers. To achieve this, our tool utilizes a secure, stateless PHP backend proxy to fetch the headers. We do not log, store, or monitor the domains you query, ensuring complete reconnaissance privacy.