java-tutorials/spring-cloud-modules/spring-cloud-gateway/src/main/resources/application-customroutes.yml

spring:
  cloud:
    gateway:
      routes:
      - id: golden_route
        uri: https://httpbin.org
        predicates:
        - Path=/api/**
        - GoldenCustomer=true
        filters:
        - StripPrefix=1
        - AddRequestHeader=GoldenCustomer,true
      - id: common_route
        uri: https://httpbin.org
        predicates:
        - Path=/api/**
        - name: GoldenCustomer
          args:
            golden: false
            customerIdCookie: customerId
        filters:
        - StripPrefix=1
        - AddRequestHeader=GoldenCustomer,false