5 Security Headers Your Website Is Missing (and How to Add Them in 2 Minutes)

I scanned the top 100 websites on the Tranco list last week. You know how many had all recommended security headers? Twelve. The other 88 were missing at least one critical security header that takes 2 minutes to add. What Are Security Headers? Security headers are HTTP response headers that tell browsers how to behave when handling your site's content. They prevent XSS, clickjacking, MIME sniffing, and other common attacks. Here are the 5 most important ones — and how to add each in under 2 minutes. 1. Content-Security-Policy (CSP) What it prevents: Cross-Site Scripting (XSS), data injection attacks Missing from: 72% of websites in my scan Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' Add it: Express.js: const helmet = require ( ' helmet ' ); app . use ( helmet . contentSecurityPolicy ({ directives : { defaultSrc : [ " 'self' " ], scriptSrc : [ " 'self' " ], styleSrc : [ " 'self' " , " 'un