spring cluod gateway

spring boot 2.2.0 
spring cluod Hoxton.RC1
配置
    gateway:
      routes:
      - id: path_route
        uri: http://cxytiandi.com
        predicates:
        - Path=/course
访问localhost:2001/course报502 Bad Gateway
而换成书上的spring boot 2.0.6.RELEASE spring cloud  Finchley.SR2就没问题,这个该怎么解决啊