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Browsers enforce the same-origin policy to prevent malicious cross-site requests. Preflight acts as a “handshake” before sensitive requests, asking: “Server, are you cool with this?” 🔥 Triggers for Preflight: Non-simple HTTP methods (PUT, DELETE, PATCH) Custom headers (e.g., X-API-Token) “Advanced” Content-Types (e.g., application/json) Credentialed requests (with cookies/auth) ✅ Simple requests (GET/POST with basic headers) skip preflight! 🔁 How Preflight Works: A 2-Step Dance sequenceDiagram Browser->>Server: OPTIONS Request (Preflight) Note left of Browser: Headers sent:<br>📍 Origin<br>📍 Access-Control-Request-Method<br>📍 Access-Control-Request-Headers alt Server Allows Server-->>Browser: 200 OK + CORS Headers Note right of Server: Headers returned:<br>✅ Access-Control-Allow-Origin<br>✅ Access-Control-Allow-Methods<br>✅ Access-Control-Allow-Headers Browser->>Server: Actual Request (e.g., DELETE) else Server Denies Server-->>Browser: CORS Error Blocked! end ⚙️ Server-Side Setup Essentials Handle OPTIONS requests correctly: ...

Understanding HTTP Request Smuggling: A Deep Dive into Web Security In the dynamic world of web security, new threats and vulnerabilities continuously emerge, challenging the robustness of our digital infrastructures. Among these, HTTP request smuggling stands out as a complex yet intriguing exploit that targets the very foundations of how the web operates. This blog post aims to unravel the complexities of HTTP request smuggling, exploring its mechanisms, potential impacts, and effective countermeasures to safeguard against this sophisticated cyber threat. ...