配置文件配置了自动转发
spring.cloud.gateway.discovery.locator.enabled= true 但是用微服务路径访问时一直报503
[fa9cc893-1] There was an unexpected error (type=Service Unavailable, status=503).这个503看得我是一头雾水。原因在于这个默认错误页的报错显示不全，需要开启两个配置帮助检查
#输出错误页的异常信息
server.error.include-message=always
#输出错误页的异常栈（开发环境开启，生产环境关闭）
server.error.include-stacktrace=always开启后看报错内容好多了
[fa9cc893-1] There was an unexpected error (type=Service Unavailable, status=503).
Unable to find instance for user-center
org.springframework.cloud.gateway.support.NotFoundException: 503 SERVICE_UNAVAILABLE "Unable to find instance for user-center"at org.springframework.cloud.gateway.support.NotFoundException.create(NotFoundException.java:45)报错原因为找不到微服务实例
根据关键词搜索找到这么一篇Sping Cloud Gateway Unable to find instance for_jonhy.luo的博客-CSDN博客
废弃ribbon这个跟我这个有点像，我的spring cloud alibaba版本为2021.0.5.0，spring cloud 版本为2021.0.5
增加loadbalance依赖
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>重新启动gateway工程，默认转发正常了。
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