#securityheaders

Clickjacking hides your site in an invisible frame to hijack visitor clicks. Learn how it works and the single HTTP header that stops it for good.

Plain-English guide to security headers: what they are, the 5 every small site needs (CSP, HSTS, and more), and exact code to add them.

X-Frame-Options tells browsers whether your site may be embedded in a frame, and it is the classic defense against clickjacking. Here is how DENY and SAMEORIGIN work, which values silently fail, and when to switch to CSP frame-ancestors.

Mozilla Observatory was sunset in September 2024 and its MDN successor tests HTTP headers only. Here are the best replacements for 2026, compared side by side.

If you've scanned your website and received a warning about a missing HSTS header, you're not alone....

Tanya Janca dissects how to applying security headers differs for ASP.Net versus .Net CORE.