Filters vs Interceptors vs AOP — when each

🧠 The big idea in one line Filters, interceptors, and aspects are three places to run code around a request — at three different depths of the stack. Every web app has work that isn't the "real" job of any single endpoint: logging, timing, auth checks, adding headers, collecting metrics. Copying that work into every controller method is a mess. You repeat it everywhere, and you forget it somewhere. A cross-cutting concern is a job that applies to many requests or many methods — it c