title: Jhipster gateway forwarding and timeout error
body: <p>i am using jhipster and gateway while uploading a file its take time for response, but gateway already given exception message timeout and forwarding error tried multiple thing but didn't work</p>
  
  <h2>In application properties i already tried,</h2>
  
  <pre><code>zuul:
      host:
          connect-timeout-millis: 10000
          socket-timeout-millis: 10000
  
  hystrix:
      command:
          default:
              execution:
                  timeout:
                      enabled: false
  </code></pre>
  
  <hr>
  
  <pre><code>zuul:
      host:
          connect-timeout-millis: 10000
          socket-timeout-millis: 10000
  
  hystrix:
      command:
          default:
              execution:
                  isolation:
                      thread:
                          timeoutInMilliseconds: 60000
  </code></pre>
  
  <hr>
  
  <blockquote>
    <p>2018-10-03 16:09:10.621 DEBUG 13048 --- [  XNIO-5 task-1]
    c.c.w.g.a.AccessControlFilter            : Access Control: allowing
    access for /core/api/ci/upload/file, as no access control policy has
    been set up for service: core 2018-10-03 16:09:15.726  WARN 13048 ---
    [  XNIO-5 task-1] o.s.c.n.z.filters.post.SendErrorFilter   : Error
    during filtering</p>
    
    <p>com.netflix.zuul.exception.ZuulException: Forwarding error
            at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:188)
            at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:163)
            at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:111)
            at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:112)
            at com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:193)
            at com.netflix.zuul.FilterProcessor.runFilters(FilterProcessor.java:157)
            at com.netflix.zuul.FilterProcessor.route(FilterProcessor.java:118)
            at com.netflix.zuul.ZuulRunner.route(ZuulRunner.java:96)
            at com.netflix.zuul.http.ZuulServlet.route(ZuulServlet.java:116)
            at com.netflix.zuul.http.ZuulServlet.service(ZuulServlet.java:81)
            at org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:157)
            at org.springframework.cloud.netflix.zuul.web.ZuulController.handleRequest(ZuulController.java:44)
            at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
            at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
            at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
            at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
            at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
            at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
            at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
            at com.codahale.metrics.servlet.AbstractInstrumentedFilter.doFilter(AbstractInstrumentedFilter.java:111)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
            at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
            at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at com.xxx.web.security.jwt.JWTFilter.doFilter(JWTFilter.java:45)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
            at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
            at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
            at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347)
            at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
            at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
            at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
            at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
            at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:64)
            at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
            at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)
            at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
            at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
            at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
            at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
            at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
            at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
            at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
            at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
            at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
            at io.undertow.servlet.handlers.SessionRestoringHandler.handleRequest(SessionRestoringHandler.java:119)
            at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
            at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
            at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
            at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
            at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
            at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
            at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
            at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
            at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
            at io.undertow.server.Connectors.executeRootHandler(Connectors.java:336)
            at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
            at java.lang.Thread.run(Thread.java:748) Caused by: com.netflix.client.ClientException: null
            at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:123)
            at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:105)
            at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:43)
            at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)
            at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
            at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
            at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
            at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.Observable.subscribe(Observable.java:10307)
            at rx.Observable.subscribe(Observable.java:10274)
            at rx.internal.operators.BlockingOperatorToFuture.toFuture(BlockingOperatorToFuture.java:51)
            at rx.observables.BlockingObservable.toFuture(BlockingObservable.java:412)
            at com.netflix.hystrix.HystrixCommand.queue(HystrixCommand.java:378)
            at com.netflix.hystrix.HystrixCommand.execute(HystrixCommand.java:344)
            at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:157)
            ... 114 common frames omitted Caused by: java.lang.RuntimeException: java.net.SocketTimeoutException: Read
    timed out
            at rx.exceptions.Exceptions.propagate(Exceptions.java:58)
            at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:465)
            at rx.observables.BlockingObservable.single(BlockingObservable.java:342)
            at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:117)
            ... 174 common frames omitted 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:171)
            at java.net.SocketInputStream.read(SocketInputStream.java:141)
            at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137)
            at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153)
            at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:282)
            at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138)
            at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56)
            at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259)
            at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)
            at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:165)
            at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)
            at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)
            at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)
            at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
            at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
            at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
            at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
            at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
            at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
            at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
            at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient$1.doWithRetry(RetryableRibbonLoadBalancingHttpClient.java:93)
            at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient$1.doWithRetry(RetryableRibbonLoadBalancingHttpClient.java:71)
            at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:287)
            at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:164)
            at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient.executeWithRetry(RetryableRibbonLoadBalancingHttpClient.java:113)
            at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient.execute(RetryableRibbonLoadBalancingHttpClient.java:104)
            at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient.execute(RetryableRibbonLoadBalancingHttpClient.java:50)
            at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:109)
            at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303)
            at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287)
            at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:231)
            at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:228)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.drain(OnSubscribeConcatMap.java:286)
            at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.onNext(OnSubscribeConcatMap.java:144)
            at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:185)
            at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180)
            at rx.Observable.unsafeSubscribe(Observable.java:10211)
            at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94)
            at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
            at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
            at rx.Observable.subscribe(Observable.java:10307)
            at rx.Observable.subscribe(Observable.java:10274)
            at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:445)
            ... 176 common frames omitted</p>
  </blockquote>