Welcome to the 19th part of our Cybersecurity series! We have learned about many active attacks like XSS, CSRF, and SSRF. But did you know that you can prevent many of these attacks just by adding a few lines of configuration to your server? Today, we are talking about HTTP Security Headers . What are HTTP Security Headers? When you visit a website, the server sends a response. Along with the content (HTML), it sends "Headers"—hidden instructions for the browser. Security Headers tell the browser how to behave securely, preventing hackers from exploiting common web flaws. Top 5 Security Headers Every Site Needs To get an "A+" grade in security audits, you must implement these headers: 1. Content Security Policy (CSP) This is the most powerful header. It tells the browser which sources of scripts, images, and styles are trusted. Prevents: Cross-Site Scripting (XSS). Example: Content-Security-Policy: default-src 'self'; (Only allow content from the same...