SpringCouldEureka开启验证后无法连接注册中心

Eureka的Server端和Client端本来已经联通成功，服务注册、发现都正常；
后来开启了验证功能，Client端向Server端注册服务时，需要验证用户名和密码，问题就出现了

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.8.8.jar:1.8.8]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_191]
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) [na:1.8.0_191]
	at java.util.concurrent.FutureTask.run(FutureTask.java) [na:1.8.0_191]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_191]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_191]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]

出错原因：
因新版（Spring Cloud 2.0 以上）的security默认启用了csrf检验，要在eurekaServer端配置security的csrf检验为false

代码：

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable();// 关闭csrf检验
        super.configure(http);
    }
}

解决方法：

1. 在 Eureka Server 项目中添加一个类，继承WebSecurityConfigurerAdapter；
2. 在类上添加 @EnableWebSecurity 注解；
3. 覆盖父类的 configure(HttpSecurity http) 方法，关闭掉 csrf，至此完美解决