最近练习项目有个功能需进行三层Feign调用，且还要调外部接口，由于电脑配置低的原因，延迟挺大，
造成Feign一直提示Read timed out executing POST
feign.RetryableException: Read timed out executing POST http://****** at feign.FeignException.errorExecuting(FeignException.java:67) at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104) at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76) at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103) at com.sun.proxy.$Proxy113.getBaseRow(Unknown Source) Caused by: java.net.SocketTimeoutException: Read timed out at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) at java.net.SocketInputStream.read(SocketInputStream.java:170) at java.net.SocketInputStream.read(SocketInputStream.java:141) at java.io.BufferedInputStream.fill(BufferedInputStream.java:246) at java.io.BufferedInputStream.read1(BufferedInputStream.java:286) at java.io.BufferedInputStream.read(BufferedInputStream.java:345) at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:704) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:647) at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1569) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480) at feign.Client$Default.convertResponse(Client.java:152) at feign.Client$Default.execute(Client.java:74)首先，我们看下Feign的简介
Feign 是一个声明式的web服务客户端，这便得编写web服务客户端更容易，使用Feign 创建一个接口并对它进行注解，它具有可插拔的注解支持包括Feign注解与JAX-RS注解，Feign还支持可插拔的编码器与解码器，Spring Cloud 增加了对 Spring MVC的注解，Spring Web 默认使用了HttpMessageConverters, Spring Cloud 集成 Ribbon 和 Eureka 提供的负载均衡的HTTP客户端 Feign.
这么说吧，Feign接口调用分两层，Ribbon的调用和Hystrix调用，理论上设置Ribbon的时间即可，但是Ribbon的超时时间和Hystrix的超时时间需要结合起来，按照木桶原则最低的就是Feign的超时时间，建议最好配置超时时间一致。经过配置一下application设置后，完美解决了问题。因为第三方接口中需要3~20秒不等的时间，所以这个数值也是根据自己的业务系统情况设置的。 application.xml
#hystrix的超时时间 hystrix: command: default: execution: timeout: enabled: true isolation: thread: timeoutInMilliseconds: 30000 #ribbon的超时时间 ribbon: ReadTimeout: 30000 ConnectTimeout: 30000
