Using 'AbortController' for Request Cancellation

Use AbortController to propagate cancellation signals through asynchronous chains, stopping unnecessary work if the user disconnects or a timeout occurs.

Modern Node.js (v15+) has standardized AbortController. If an HTTP request is made and the user closes the browser, the server should stop fetching data from the DB or external APIs to save resources. By passing an AbortSignal into fetch() or fs methods, you can stop these operations mid-flight.