问题介绍：
服务之间调用报错超时，截取部分报错，Read timed out executing POST http://******
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)
原因及解决办法：
明显可以看到是http请求报错超时，feign的调用分两层，ribbon的调用和hystrix的调用，高版本的hystrix默认是关闭的，所以在application.properties配置文件中设置ribbon即可
#请求处理的超时时间
ribbon.ReadTimeout: 120000
#请求连接的超时时间
ribbon.ConnectTimeout: 30000
如果开启hystrix，hystrix的超时报错如下图：
FeignDemo#demo() timed-out and no fallback available。和ribbon超时报错还是有区别的
com.netflix.hystrix.exception.HystrixRuntimeException: FeignDemo#demo() timed-out and no fallback available.
at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:819)
at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:804)
at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:140)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at com.netflix.hystrix.AbstractCommand$DeprecatedOnFallbackHookApplication$1.onError(AbstractCommand.java:1472)
at com.netflix.hystrix.AbstractCommand$FallbackHookApplication$1.onError(AbstractCommand.java:1397)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at rx.observers.Subscribers$5.onError(Subscribers.java:230)
Caused by: java.util.concurrent.TimeoutException
at com.netflix.hystrix.AbstractCommand.handleTimeoutViaFallback(AbstractCommand.java:997)
at com.netflix.hystrix.AbstractCommand.access$500(AbstractCommand.java:60)
at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:610)
at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:601)
解决办法：
feign.hystrix.enabled: true
hystrix 熔断机制
hystrix:
shareSecurityContext: true
command:
default:
circuitBreaker:
sleepWindowInMilliseconds: 100000
forceClosed: true
execution:
isolation:
thread:
timeoutInMilliseconds: 600000