Introduction HTTP Request Smuggling is often misunderstood as a simple WAF bypass technique. In reality, it is caused by a deeper issue in how different components in a web architecture interpret HTTP requests. The vulnerability emerges when multiple layers do not agree on where one request ends and another begins. How it actually happens In a typical web architecture, a request may pass through: reverse proxy or load balancer CDN or caching layer backend application server Each of these components may parse HTTP requests slightly differently. When these interpretations are not aligned, a single request can be split or merged in unexpected ways. The real issue The core problem can be summarized as: different systems disagreeing on request boundaries This disagreement leads to a desynchronization between frontend and backend behavior.…