com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

在调试eureka服务器和客户端时，经常会出现这个错误，具体报错信息如下：

2019-03-23 14:53:23.041 WARN 58097 — [tbeatExecutor-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failed with message: A message body reader for Java class com.netflix.appinfo.InstanceInfo, and Java type class com.netflix.appinfo.InstanceInfo, and MIME media type text/html was not found
2019-03-23 14:53:23.041 ERROR 58097 — [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_EUREKA-CLIENT/10.17.34.12:eureka-client:9000 - was unable to send heartbeat!
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)
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89)
at
com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) at com.netflix.discovery.DiscoveryClient.renew(DiscoveryClient.java:846) at com.netflix.discovery.DiscoveryClient$3.execute(EurekaHttpClientDecorator.java:92)atcom.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77)atcom.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89)atcom.netflix.discovery.DiscoveryClient.renew(DiscoveryClient.java:846)atcom.netflix.discovery.DiscoveryClientHeartbeatThread.run(DiscoveryClient.java:1399)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$RunnableAdapter.call(Executors.java:511)atjava.util.concurrent.FutureTask.run(FutureTask.java:266)atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)atjava.util.concurrent.ThreadPoolExecutorWorker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

报错信息截图:

问题分析：

服务端报错：
可能时服务端像自己注册了，需要关闭服务端向自己注册
eureka:
client:
fetch-registry: false
register-with-eureka: false
service-url:
defaultZone: http://${eureka.instance.hostname}:$eureka.instance.hostname:{server.port}/eureka/
这里需要注意一下，配置文件中idea提示会出现default-zone这种形式，也会报错改为defaultZone

客户端报错：二个原因
1 、可能是服务端没有跑起来
2、 defaultZone: 配置的URL有问题
3、可能是服务端的端口被占用
针对第2种情况，
一、你需要认真检查一下 defaultZone: 的配置，和服务端的配置是否一直，

二、 或者是Spring2.0以后默认开的安全验证，你需要手动关闭，关闭方法为添加一个配置方法。

/**
 * 高版本的丢弃了
 *
 * security:
 *   basic:
 *    enabled: true
 * 配置，应该使用以下方式开启
 * @param http
 * @throws Exception
 */ 

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
// Configure HttpSecurity as needed (e.g. enable http basic).
http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.NEVER);
http.csrf().disable();
//注意：为了可以使用 http://${user}:$user:{password}@${host}:$host:{port}/eureka/ 这种方式登录,所以必须是httpBasic,
// 如果是form方式,不能使用url格式登录
http.authorizeRequests().anyRequest().authenticated().and().httpBasic();
}
}
然后添加对应的@EnableWebSecurity依赖即可

org.springframework.boot
spring-boot-starter-security