Headers

Let me be blunt: if you’re not running Content Security Policy on your website, you’re leaving the front door wide open for Cross-Site Scripting (XSS) attacks. And no, input sanitization isn’t enough. It never has been. I’ve seen countless security audit reports where everything looks great on paper — input validation, output encoding, WAF rules — but one missing CSP header turns all of that into a suggestion rather than a guarantee. ...

I’ve seen too many CSP implementation guides that show you a perfect policy for a perfect application and pretend everything will just work. In the real world, implementing CSP is messy. You’ll hit issues you didn’t expect. Your CMS will inject inline scripts you forgot about. That analytics tool your marketing team added last quarter? It breaks everything. This guide is for people implementing CSP on real applications. Not demos. Not fresh create-react-app projects. The kind of application that has accumulated technical debt, third-party scripts, and “temporary” hacks that have been there for three years. ...