2、spring cloud gateway主要的配置Predicates

Predicates 写法

有两种方式配置谓词列表：简写和完整写法。

# 简写
spring:
  cloud:
    gateway:
      routes:
      - id: after_route # 唯一标识
        uri: https://example.org # 代理服务URI，predicates通过后会被路由到这里
        predicates: # 一组谓词
        - Cookie=mycookie,mycookievalue #见完整写法
        
# 完整写法
spring:
  cloud:
    gateway:
      routes:
      - id: after_route
        uri: https://example.org
        predicates:
        # 简写就是把name和args组合起来了，并且把key-value以逗号（,）的形式分割
        - name: Cookie # 表明该谓词是判断Cookie
          args:
            name: mycookie # Cookie中是否包含name=mycookie的键
            regexp: mycookievalue # name=mycookie的键值是不是=mycookievalue

Predicates 的name有多少

After 在指定时间之后的请求都被路由，可用来解决消费高峰期扩容消费服务

spring:
  cloud:
    gateway:
      routes:
      - id: after_route
        uri: https://example.org
        predicates:
        - After=2016-01-20T17:42:47.789-07:00[Asia/Shanghai]

Before 在指定时间之前的请求都被路由，可用来解决消费高峰期扩容消费服务

spring:
  cloud:
    gateway:
      routes:
      - id: before_route
        uri: https://example.org
        predicates:
        - Before=2016-01-30T05:42:47.789-07:00[Asia/Shanghai]

Between 在指定时间范围内请求被调用，可用来解决阶段消费高峰期扩容消费服务

spring:
  cloud:
    gateway:
      routes:
      - id: between_route
        uri: https://example.org
        predicates:
        - Between=2017-01-20T17:42:47.789-07:00[Asia/Shanghai], 2017-01-21T17:42:47.789-07:00[Asia/Shanghai]

Cookie 当cookie中包含指定key-value时执行，value可采用正则表达式方式

spring:
  cloud:
    gateway:
      routes:
      - id: cookie_route
        uri: https://example.org
        predicates:
        # 表示cookie中包含name=uid,并且value匹配ch.p的请求（key-value以,分割）
        - Cookie=uid, ch.p 

Header 验证请求头是否包含指定内容，可用于鉴权

spring:
  cloud:
    gateway:
      routes:
      - id: header_route
        uri: https://example.org
        predicates:
        - Header=X-Request-Id, \d 

Host

spring:
  cloud:
    gateway:
      routes:
      - id: host_route
        uri: https://example.org
        predicates:
        - Host=**.somehost.org,**.anotherhost.org

Method 指定请求的Method（GET or POST等等）

spring:
  cloud:
    gateway:
      routes:
      - id: method_route
        uri: https://example.org
        predicates:
        - Method=GET,POST

Path 很常用的一个，根据路径路由服务

spring:
  cloud:
    gateway:
      routes:
      - id: path_route
        uri: https://example.org
        predicates:
        - Path=/red/{segment},/blue/{segment}

Query 匹配查询参数

spring:
 cloud:
   gateway:
     routes:
     - id: query_route
       uri: https://example.org
       predicates:
       - Query=green # 查询参数有green=abc时命中

RemoteAddr 路由指定服务器发起的服务

spring:
  cloud:
    gateway:
      routes:
      - id: remoteaddr_route
        uri: https://example.org
        predicates:
        - RemoteAddr=192.168.1.1/24

Weight 设置路由权重，灰度上线时可用于适度引流

spring:
  cloud:
    gateway:
      routes:
      - id: weight_high
        uri: https://weighthigh.org
        predicates:
        - Weight=group1, 8 # 80% 引流到https://weighthigh.org
      - id: weight_low
        uri: https://weightlow.org
        predicates:
        - Weight=group1, 2 # 20% 引流到 https://weightlow.org

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