Understanding HTTP Request Smuggling Attacks
HTTP Request Smuggling (HRS) is a powerful web application vulnerability that exploits discrepancies in how different servers or intermediaries parse and handle HTTP requests. This misalignment can allow an attacker to “smuggle” a malicious request through a front-end server (such as a load balancer, proxy, or CDN) so that it is interpreted differently by the back-end server. How HTTP Request Smuggling Works Modern web applications often rely on chains of intermediaries — proxies, reverse proxies, CDNs, and application servers. These components must all agree on where one HTTP request ends and the next begins. If they disagree, attackers can craft specially malformed requests that cause desynchronization. ...