How to check if your website has missing security headers (and why it matters)
What are security headers, really?
When your browser requests a page, the server sends back the page content plus a set of HTTP headers — instructions that tell the browser how to handle that content safely. A handful of these headers exist specifically to reduce your exposure to common attacks like cross-site scripting (XSS) and clickjacking.
The headers worth checking first
Content-Security-Policy— restricts which sources of scripts, styles, and content your page is allowed to load, making it much harder for injected malicious scripts to run.Strict-Transport-Security(HSTS) — tells browsers to only ever connect to your site over HTTPS, even if someone typeshttp://by mistake.X-Frame-Options— stops your site being loaded inside an invisible frame on someone else's page, a technique used in clickjacking attacks.X-Content-Type-Options— prevents browsers from trying to "guess" file types in a way that can be exploited.
How to check your own site
You can check manually using your browser's developer tools (Network tab, click any request, look at Response Headers), or run an automated scan that checks all of them at once and tells you exactly which are missing and why each one matters.