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API 게이트웨이 패턴과 BFF(Backend for Frontend) 아키텍처를 심층 분석합니다. Kong, Envoy, GraphQL Federation의 장단점 비교, 인증·레이트리밋·라우팅 구현, 프로덕션 운영 전략을 실전 코드와 함께 다룹니다.
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