spring cloud gateway 报错：com.zuul.expection.ZuulExpception :Forwarding error

这两天在做老服务的改造，把现有的spring cloud 微服务进行docker改造，在改造到gateway时，发现调不通服务了，用Postman的测试结果如下：

{
    "timestamp": 1661909195821,
    "status": 500,
    "error": "Internal Server Error",
    "exception": "com.netflix.zuul.exception.ZuulException",
    "message": "GENERAL"
}

查了下服务器上的日志，报错提示：

 com.zuul.expection.ZuulExpception :Forwarding error

意思是转发出错，紧接着后面的报错信息如下：

com.netflix.client.clientException: null

查了一下，这是由于zuul转发时不能识别主机名导致的，在对应的yml配置文件中增加以下两行配置：

eureka:
  instance:
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

看一下这个配置项的注释：在识别地址时，优先使用ip地址，而不是主机名

Flag to say that, when guessing a hostname, the IP address of the server should be used in prference to the hostname reported by the OS. 

 加完配置后，又报错：

Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: xxx-service

提示负载均衡服务对于当前客户端不可用

Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: xxx-service
    at com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.java:483)
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:184)
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180)
    at rx.Observable.unsafeSubscribe(Observable.java:10151)
    at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94)
    at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42)
    at rx.Observable.unsafeSubscribe(Observable.java:10151)
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127)
    at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73)
    at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52)
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79)
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45)
    at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276)
    at rx.Subscriber.setProducer(Subscriber.java:209)
    at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138)
    at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
    at rx.Observable.subscribe(Observable.java:10247)
    at rx.Observable.subscribe(Observable.java:10214)
    at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:444)
    at rx.observables.BlockingObservable.single(BlockingObservable.java:341)
    at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112)
    at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:187)
    at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:52)
　　以下略

为当前服务开启负载均衡就行了，同样在yml配置文件新增以下配置：

ribbon:
  ReadTimeout: 10000
  SocketTimeout: 10000
  eureka:
    enabled: true

重启gateway，问题解决。再使用postman测试，发现能够跳转过去了

 顺带吐槽以下，怎么截图完直接ctrl+v不能直接上传图片了，还得自己保存好了，重新上传，不知道是什么问题