Content Security Policy (CSP): Why It Exists, How It Improves Security, and Life Before CSP
Introduction
Modern web applications operate in an increasingly hostile environment. Browsers execute third-party scripts, load assets from multiple domains, and process user-supplied data continuously. This flexibility, while powerful, historically created a vast attack surface—especially for client-side attacks such as Cross-Site Scripting (XSS).
Content Security Policy (CSP) was introduced to
