# API Gateway（Zuul）

## 什么是API Gateway？

在Spring Cloud微服务系统中，一种常见的负载均衡方式是，客户端的请求首先经过负载均衡（zuul、Ngnix），再到达服务网关（zuul集群），然后再到具体的服务。

## 什么是Zuul？

Routing in an integral part of a microservice architecture. For example, / may be mapped to your web application, /api/users is mapped to the user service and /api/shop is mapped to the shop service. Zuul is a JVM based router and server side load balancer by Netflix.

路由在微服务架构的一个组成部分。 例如，/可以映射到您的Web应用程序，/ api / users映射到用户服务，并且/ api / shop映射到商店服务。 Zuul是Netflix的基于JVM的路由器和服务器端负载均衡器。

其功能包括

* 验证
* 见解
* 压力测试
* 金丝雀测试
* 动态路由
* 服务迁移
* 减载
* 安全
* 静态响应处理
* 主动/主动流量管理

Zuul的规则引擎允许规则和过滤器基本上用任何JVM语言编写，内置支持Java和Groovy。


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