feign时一个声明式的Web服务客户端。它具有可插入注释支持，包括Feign注释和JAX-RS注释。Feign还支持可插拔编码器和解码器。Spring Cloud增加了对Spring MVC注释的支持，并使用Spring Web中默认使用的HttpMessageConverters。Spring Cloud集成Ribbon和Eureka以在使用Feign时提供负载均衡的http客户端。

Feign 中也使用了 Ribbon。当使用包含Ribbon客户端的Hystrix命令时，必须使Hystrix超时配置为长于配置的Ribbon超时，包括可能进行的任何潜在的重试。例如，如果Ribbon连接超时为一秒钟，并且Ribbon客户端可能会重试该请求三次，那么Hystrix超时应该略超过三秒钟。然而feign请求超时报错时，只需配置feign

1. 环境：spring cloud，eureka，feign
2. 版本：spring boot (2.1.3.RELEASE),feign (1.4.4.RELEASE)
3. 控制台错误信息

java.net.SocketTimeoutException: Read timed out
	at java.net.SocketInputStream.socketRead0(Native Method) ~[na:1.8.0_191]
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) ~[na:1.8.0_191]
	at java.net.SocketInputStream.read(SocketInputStream.java:171) ~[na:1.8.0_191]
	at java.net.SocketInputStream.read(SocketInputStream.java:141) ~[na:1.8.0_191]
	at java.io.BufferedInputStream.fill(BufferedInputStream.java:246) ~[na:1.8.0_191]
	at java.io.BufferedInputStream.read1(BufferedInputStream.java:286) ~[na:1.8.0_191]
	at java.io.BufferedInputStream.read(BufferedInputStream.java:345) ~[na:1.8.0_191]
	at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:735) ~[na:1.8.0_191]
	at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678) ~[na:1.8.0_191]
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1587) ~[na:1.8.0_191]
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492) ~[na:1.8.0_191]
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480) ~[na:1.8.0_191]
	at feign.Client$Default.convertResponse(Client.java:143) ~[feign-core-10.1.0.jar:na]
	at feign.Client$Default.execute(Client.java:68) ~[feign-core-10.1.0.jar:na]
	at org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:93) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:56) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:104) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
	at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
	at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]

解决办法。官网提供了详细的配置

feign:
  client:
    config:
      feignName:
        connectTimeout: 5000
        readTimeout: 5000
        loggerLevel: full
        errorDecoder: com.example.SimpleErrorDecoder
        retryer: com.example.SimpleRetryer
        requestInterceptors:
          - com.example.FooRequestInterceptor
          - com.example.BarRequestInterceptor
        decode404: false
        encoder: com.example.SimpleEncoder
        decoder: com.example.SimpleDecoder
        contract: com.example.SimpleContract

feign:
  client:
    config:
      default:
        connectTimeout: 5000
        readTimeout: 5000
        loggerLevel: basic

本着踩坑必填的心态，贴上自己部分代码。以便日后自己查看

1. feign

   @FeignClient(name = "YULIUSHICORE")
   public interface GoodsFeign {
   
       @RequestMapping( value = "/goods/getGoodsList",method = RequestMethod.POST)
       BaseData<Goods> getGoodsList(@RequestBody Goods goods);
   
   }

    

2. application.yml。debug使用的超时配置，时间过长。

   server:
     port: 8081
   spring:
     application:
       name: yuliushiweb
   eureka:
     client:
       service-url:
         defaultZone: http://TIPA:8761/eureka,http://TIPB:8762/eureka
   feign:
     client:
       config:
         default:
           connectTimeout: 50000
           readTimeout: 50000
           loggerLevel: basic

    

3. pom.xml

   <?xml version="1.0" encoding="UTF-8"?>
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   
       <properties>
           <java.version>1.8</java.version>
           <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
       </properties>
   
       <dependencies>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-web</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
           </dependency>
   
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-tomcat</artifactId>
               <scope>provided</scope>
           </dependency>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-test</artifactId>
               <scope>test</scope>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-config</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-feign</artifactId>
               <version>1.4.4.RELEASE</version>
           </dependency>
       </dependencies>
   
       <dependencyManagement>
           <dependencies>
               <dependency>
                   <groupId>org.springframework.cloud</groupId>
                   <artifactId>spring-cloud-dependencies</artifactId>
                   <version>${spring-cloud.version}</version>
                   <type>pom</type>
                   <scope>import</scope>
               </dependency>
           </dependencies>
       </dependencyManagement>
   
       <build>
           <plugins>
               <plugin>
                   <groupId>org.springframework.boot</groupId>
                   <artifactId>spring-boot-maven-plugin</artifactId>
               </plugin>
           </plugins>
       </build>
       <repositories>
           <repository>
               <id>spring-milestones</id>
               <name>Spring Milestones</name>
               <url>https://repo.spring.io/milestone</url>
           </repository>
       </repositories>
   </project>