Java Architect Handbook

Jul 8, 2026 · Backend Development

Why a Gateway Is Essential in Microservices and What It Actually Does

The article explains that a gateway serves as the unified entry point of a microservice system, handling routing, authentication, rate limiting, logging and protocol conversion, compares architectures with and without a gateway, details Spring Cloud Gateway's core concepts, shows configuration and custom auth filter code, and contrasts it with Zuul, providing interview‑ready insights and sample questions.