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-1.9.0.jar:1.9.0]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getDelta(EurekaHttpClientDecorator.java:149) ~[eureka-client-1.9.0.jar:1.9.0]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$7.execute(EurekaHttpClientDecorator.java:152) ~[eureka-client-1.9.0.jar:1.9.0]
	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.0.jar:1.9.0]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getDelta(EurekaHttpClientDecorator.java:149) ~[eureka-client-1.9.0.jar:1.9.0]
	at com.netflix.discovery.DiscoveryClient.getAndUpdateDelta(DiscoveryClient.java:1085) [eureka-client-1.9.0.jar:1.9.0]
	at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:967) [eureka-client-1.9.0.jar:1.9.0]
	at com.netflix.discovery.DiscoveryClient.refreshRegistry(DiscoveryClient.java:1471) [eureka-client-1.9.0.jar:1.9.0]
	at com.netflix.discovery.DiscoveryClient$CacheRefreshThread.run(DiscoveryClient.java:1438) [eureka-client-1.9.0.jar:1.9.0]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_151]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_151]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_151]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_151]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_151]

 需要手动关闭security的csrf，代码如下：

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		
		http.csrf().disable();//关闭csrf
		super.configure(http);
	}

	
}