报错日志

feign.FeignException$BadGateway: [502 Bad Gateway] during [POST] to [http://178.192.149.23:4100/v2/user/findOneByMobile] [UCenterClient#getUserByMobile(GetUserByMobileReq)]: [Unable to route request!

service name: /svc/178.192.149.23:4100
dtab:

base dtab:
  /svc => /#/io.l5d.consul/dc-test01
override dtab:

]

	at feign.FeignException.serverErrorStatus(FeignException.java:235)
	at feign.FeignException.errorStatus(FeignException.java:180)
	at feign.FeignException.errorStatus(FeignException.java:169)
	at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:92)
	at feign.AsyncResponseHandler.handleResponse(AsyncResponseHandler.java:96)
	at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:138)
	at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89)
	at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100)
	at com.sun.proxy.$Proxy74.getUserByMobile(Unknown Source)
	at com.rouchi.growth.rpc.wallet.WalletClientTest.testWalletClient(WalletClientTest.java:39)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)

原因：

这是因为我们系统平台的问题，我们的微服务平台使用的是Linkerd实现的网格化服务。为此，在调用在调用微服务时，需要将请求头中增加Host=微服务名词，但是feigin默认的请http组件过滤请求头中的Host关键字（备注：针对性很强，只针对Host关键字），通过查询Feign源码才发现的。具体的分析思路后面有空在整理。

解决方案：

替换feign默认的请求组件为feign-okhttp。
引入依赖：

 <dependency>
            <groupId>io.github.openfeign</groupId>
            <artifactId>feign-okhttp</artifactId>
</dependency>

增加配置文件

feign:
  httpclient:
    enabled: false
  okhttp:
    enabled: true