將Spring Boot升級到2.0，Spring Cloud升級到Finchley.M8時，Eureka註冊就報錯了

Eureka Server配置：

server.port=9011
spring.application.name=eureka-server 

spring.security.user.name=username
spring.security.user.password=pass

eureka.instance.hostname=localhost 
eureka.client.register-with-eureka=false 
eureka.client.fetch
 
-registry=false 
eureka.client.service-url.defaultZone=http://username:[email protected]:9011/eureka/

Eureka Client配置：

server.port=8088
spring.application.name=eureka-client 

spring.security.basic.enabled=true 
spring.security.user.name=username
spring.security.user.password=pass

eureka.instance
 
.hostname=localhost 
eureka.client.service-url.defaultZone=http://username:[email protected]:9011/eureka/

錯誤資訊如下：

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server 
        at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient
 
.execute(RetryableEurekaHttpClient.java:111) ~[eureka-client-1.8.6.jar:1.8.6] 
        at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.8.6.jar:1.8.6] 
        at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.8.6.jar:1.8.6] 
        at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.8.6.jar:1.8.6] 
        at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.8.6.jar:1.8.6] 
        at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.8.6.jar:1.8.6] 
        at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:104) [eureka-client-1.8.6.jar:1.8.6] 
        at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:88) [eureka-client-1.8.6.jar:1.8.6] 
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_92] 
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_92] 
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_92] 
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_92] 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_92] 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_92] 
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_92

去掉Spring Security後問題解決，可以知道問題是Spring Security引起的

CSRF保護預設是開啟的，可以禁用掉即可

解決方案如下：

@EnableWebSecurity
static class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable();
    }
}

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