"With reactive libraries like RxJS, we got used to easily cancelling requests on the client side… but what really happens on the back-end? Is the request really canceled? Did we really improve the app’s performance and reduce cloud costs? Or did we just trigger some crazy chaos? Let’s dig deeper into how request cancelation works from the front-end to the back-end and how we can leverage reactive frameworks and libraries like Angular, RxJS and NestJS to boost performance and reduce costs from the front-end to the database with some reactive programming. "