네트워크 프로그래밍에서는 요청마다 소요 시간과 타임 아웃이 다를 수 있고 작동을 예측할 수
없다. 자바스크립트 기반의 웹 애플리케이션에서는 요청이 완료되는 것을 기다렸다가 다른 요
청을 시작하기보다는 비동기 프로그래밍 모델을 통해 문제를 다룬다. 동기식으로 처리할 때에
비해 속도가 수십 배 빨라 상당히 성능에 이점이 있다. 한 요청이 완료될 때까지 기다렸다가 다
음 요청을 하는 대신 ...
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