问题描述
我正在进入 Spring Cloud 2020.0.0 的世界。
我有一个配置服务器、网关服务器、eureka 服务器和第一个微服务设置，并部署在一个开发环境中，它们都可以相互通信。它们是 config-first，并且都成功地从 config 服务器拉下属性源，然后注册到 eureka 服务器。因为我至少现在没有为我的服务应用设置 DNS，所以我有 preferIpAddress: true。
跟踪 spring-cloud-gateway 的日志级别，我看到发现客户端选择了这些 eureka 注册的应用程序：
2021-01-28 14:49:28.438 DEBUG 14432 --- [ main] o.s.c.g.r.RouteDeFinitionRouteLocator : RouteDeFinition ReactiveCompositediscoveryClient_CLOUD-SERVICES-CONfig applying {pattern=/CLOUD-SERVICES-CONfig/**} to Path
2021-01-28 14:49:28.476 DEBUG 14432 --- [ main] o.s.c.g.r.RouteDeFinitionRouteLocator : RouteDeFinition ReactiveCompositediscoveryClient_CLOUD-SERVICES-CONfig applying filter {regexp=/CLOUD-SERVICES-CONfig/(?<remaining>.*),replacement=/${remaining}} to RewritePath
2021-01-28 14:49:28.509 DEBUG 14432 --- [ main] o.s.c.g.r.RouteDeFinitionRouteLocator : RouteDeFinition matched: ReactiveCompositediscoveryClient_CLOUD-SERVICES-CONfig
and so on...
在本地运行 API 网关（我也有一个已部署的实例），Postman GET @ http://localhost:8080/DATA-SERVICES-PERSON-1_0 导致 Route matched: ReactiveCompositediscoveryClient_DATA-SERVICES-PERSON-1_0 以及
java.lang.IllegalStateException: Invalid host: lb://DATA-SERVICES-PERSON-1_0
at org.springframework.cloud.gateway.filter.RoutetoRequestUrlFilter.filter(RoutetoRequestUrlFilter.java:85) ~[spring-cloud-gateway-server-3.0.0.jar:3.0.0]
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ HTTP GET "/DATA-SERVICES-PERSON-1_0/" [ExceptionHandlingWebHandler]
Stack trace:
at org.springframework.cloud.gateway.filter.RoutetoRequestUrlFilter.filter(RoutetoRequestUrlFilter.java:85) ~[spring-cloud-gateway-server-3.0.0.jar:3.0.0]
at org.springframework.cloud.gateway.handler.FilteringWebHandler$GatewayFilteradapter.filter(FilteringWebHandler.java:137) ~[spring-cloud-gateway-server-3.0.0.jar:3.0.0]
at org.springframework.cloud.gateway.filter.OrderedGatewayFilter.filter(OrderedGatewayFilter.java:44) ~[spring-cloud-gateway-server-3.0.0.jar:3.0.0]
at org.springframework.cloud.gateway.handler.FilteringWebHandler$DefaultGatewayFilterChain.lambda$filter$0(FilteringWebHandler.java:117) ~[spring-cloud-gateway-server-3.0.0.jar:3.0.0]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Mono.subscribe(Mono.java:4046) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:173) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Mono.subscribe(Mono.java:4046) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:173) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:157) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:73) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:281) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:860) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:120) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:73) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1784) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:151) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:120) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:281) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:860) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonopeekTerminal$MonoTerminalPeekSubscriber.onNext(MonopeekTerminal.java:180) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1784) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onNext(MonoFilterWhen.java:149) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Operators$Scalarsubscription.request(Operators.java:2346) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onSubscribe(MonoFilterWhen.java:112) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Mono.subscribe(Mono.java:4046) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:448) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onNext(FluxConcatMap.java:250) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:98) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:44) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:270) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:228) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.request(FluxDematerialize.java:127) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:235) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onSubscribe(FluxDematerialize.java:77) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:164) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:86) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalFluxOperator.subscribe(InternalFluxOperator.java:62) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxDefer.subscribe(FluxDefer.java:54) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Mono.subscribe(Mono.java:4046) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:448) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:218) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:164) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:86) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.Mono.subscribe(Mono.java:4046) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:173) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.1.jar:3.4.1]
at reactor.netty.http.server.HttpServer$HttpServerHandle.onStateChange(HttpServer.java:632) ~[reactor-netty-http-1.0.2.jar:1.0.2]
at reactor.netty.ReactorNetty$CompositeConnectionObserver.onStateChange(ReactorNetty.java:612) ~[reactor-netty-core-1.0.2.jar:1.0.2]
at reactor.netty.transport.ServerTransport$Childobserver.onStateChange(ServerTransport.java:453) ~[reactor-netty-core-1.0.2.jar:1.0.2]
at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:510) ~[reactor-netty-http-1.0.2.jar:1.0.2]
at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:94) ~[reactor-netty-core-1.0.2.jar:1.0.2]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:208) ~[reactor-netty-http-1.0.2.jar:1.0.2]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.handler.codec.BytetoMessageDecoder.fireChannelRead(BytetoMessageDecoder.java:324) ~[netty-codec-4.1.55.Final.jar:4.1.55.Final]
at io.netty.handler.codec.BytetoMessageDecoder.channelRead(BytetoMessageDecoder.java:296) ~[netty-codec-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[netty-transport-4.1.55.Final.jar:4.1.55.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-common-4.1.55.Final.jar:4.1.55.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.55.Final.jar:4.1.55.Final]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.55.Final.jar:4.1.55.Final]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
我已经查看了几乎所有指南，其中似乎最有意义，因为 2020.0.0 仍然是新发布的。我在这里缺少什么？我已经尝试了几乎所有跟在应用程序名称后面的资源路径，包括一个应该是服务控制器将要访问的资源路径。全部返回到无效主机：lb://..
解决方法
我想通了，这是因为为 DATA-SERVICES-PERSON-1_0 注册到 Eureka 的 Spring 应用程序名称有一个下划线。删除/替换该字符解决了问题，现在可以正确路由。