问题再现：
2023-08-15 16:51:16,151 DEBUG [reactor-http-nio-2][CompositeLog.java:147] - [dc73b32c-1] Encoding [{timestamp=Tue Aug 15 16:51:16 CST 2023, path=/content/course/list, status=503, error=Service Unavai (truncated)...]
2023-08-15 16:51:16,175 TRACE [reactor-http-nio-2][GatewayMetricsFilter.java:115] - gateway.requests tags: [tag(httpMethod=POST),tag(httpStatusCode=503),tag(outcome=SERVER_ERROR),tag(routeId=content-api),tag(routeUri=lb://content-api),tag(status=SERVICE_UNAVAILABLE)]
2023-08-15 16:51:16,187 DEBUG [reactor-http-nio-2][Loggers.java:254] - [id: 0xdc73b32c, L:/127.0.0.1:63010 - R:/127.0.0.1:53113] Decreasing pending responses, now 0
2023-08-15 16:51:16,190 DEBUG [reactor-http-nio-2][Loggers.java:249] - [id: 0xdc73b32c, L:/127.0.0.1:63010 - R:/127.0.0.1:53113] Last HTTP packet was sent, terminating the channel
2023-08-15 16:51:16,192 DEBUG [reactor-http-nio-2][LogFormatUtils.java:91] - [dc73b32c-1] Completed 503 SERVICE_UNAVAILABLE
2023-08-15 16:51:16,195 DEBUG [reactor-http-nio-2][Loggers.java:249] - [id: 0xdc73b32c, L:/127.0.0.1:63010 - R:/127.0.0.1:53113] Last HTTP response frame
2023-08-15 16:51:16,203 DEBUG [reactor-http-nio-2][Loggers.java:254] - [id: 0xdc73b32c, L:/127.0.0.1:63010 - R:/127.0.0.1:53113] FluxReceive{pending=0, cancelled=true, inboundDone=false, inboundError=null}: dropping frame DefaultLastHttpContent(data: PooledSlicedByteBuf(ridx: 0, widx: 53, cap: 53/53, unwrapped: PooledUnsafeDirectByteBuf(ridx: 296, widx: 296, cap: 2048)), decoderResult: success)
2023-08-15 16:51:16,205 DEBUG [reactor-http-nio-2][Loggers.java:259] - [id: 0xdc73b32c, L:/127.0.0.1:63010 - R:/127.0.0.1:53113] onUncaughtException(SimpleConnection{channel=[id: 0xdc73b32c, L:/127.0.0.1:63010 - R:/127.0.0.1:53113]})
java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at sun.nio.ch.SocketDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379)
at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:253)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1134)
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:750)
2023-08-15 16:51:16,432 DEBUG [com.alibaba.nacos.naming.failover][FailoverReactor.java:147] - failover switch is not found, failover00-00---000-VIPSRV_FAILOVER_SWITCH-000---00-00
2023-08-15 16:51:17,002 DEBUG [PollingServerListUpdater-0][PropertySourcesPropertyResolver.java:115] - Found key 'spring.profiles.active' in PropertySource 'configurationProperties' with value of type String
2023-08-15 16:51:17,003 DEBUG [PollingServerListUpdater-0][HostReactor.java:306] - failover-mode: false
2023-08-15 16:51:17,003 DEBUG [PollingServerListUpdater-0][DynamicServerListLoadBalancer.java:241] - List of Servers for content-api obtained from Discovery client: []
2023-08-15 16:51:17,003 DEBUG [PollingServerListUpdater-0][DynamicServerListLoadBalancer.java:246] - Filtered List of Servers for content-api obtained from Discovery client: []
问题前提的环境配置：
首先我的nacos上都已经成功注册上了两个服务
其中Gateway的nacos上的配置和本地的配置分别为
server: port: 63010 # 网关端口 spring: cloud: gateway: discovery: locator: lowerCaseServiceId: true # 让gateway根据注册中心找到其他服务 enabled: true routes: - id: content-api # 路由id，自定义，只要唯一即可 uri: lb://content-api # 路由的目标地址 lb就是负载均衡，后面跟服务名称 predicates: # 路由断言，也就是判断请求是否符合路由规则的条件 - Path=/content/** # 这个是按照路径匹配，只要以/content/开头就符合要求 - id: system-api uri: lb://system-api predicates: - Path=/system/**
#微服务配置 spring: application: name: gateway cloud: nacos: server-addr: 192.168.101.65:8848 discovery: namespace: ${spring.profiles.active} group: EducationPlatform-project config: namespace: ${spring.profiles.active} group: EducationPlatform-project file-extension: yaml refresh-enabled: true shared-configs: - data-id: logging-${spring.profiles.active}.yaml group: EducationPlatform-common refresh: true profiles: active: dev11
而content-api的nacos上的配置和本地的配置分别为
server: servlet: context-path: /content port: 63040 test_config: a: 3a b: 3b #配置本地优先 spring: cloud: config: override-none: true
#微服务配置 spring: application: name: content-api cloud: nacos: server-addr: 192.168.101.65:8848 discovery: namespace: ${spring.profiles.active} group: EducationPlatform username: nacos password: nacos config: namespace: ${spring.profiles.active} group: EducationPlatform file-extension: yaml refresh-enabled: true extension-configs: - data-id: content-service-${spring.profiles.active}.yaml group: EducationPlatform refresh: true shared-configs: - data-id: swagger-${spring.profiles.active}.yaml group: EducationPlatform-common refresh: true - data-id: logging-${spring.profiles.active}.yaml group: EducationPlatform-common refresh: true profiles: active: dev11
而发送了一个这个请求
问题解决：
首先可以在idea里快速的按两下shift，然后搜这个方法名，打个断点看看方法能不能送到这里来，可以看到我这的uri已经是有了的，证明配置和服务都没有问题，问题缩小到路由转发出了问题。
其次这两个问题报错也让我们要注意的问题就是转发问题
Zone aware logic disabled or there is only one zone
NotFoundException: 503 SERVICE_UNAVAILABLE "Unable to find instance for content-api
一、pom配置
因为路由转发配置上用到了lb:，这个是负载均衡的标志，而在Spring Cloud 2020版本以后，就移除了Ribbon负载均衡器，官方默认推荐使用Spring Cloud Loadbalancer正式替换Ribbon。因此我们需要把Spring Cloud Loadbalancer加载到pom里面
<!--客户端负载均衡loadbalancer--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-loadbalancer</artifactId> <optional>true</optional> </dependency>
实在不行的再加载这两个
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency>
二、小细节
我是加上了pom都还不行的，而后面发现我的group是不同的，在nacos中group的作用就是区分不同类型的配置文件，进行分组管理
相同Data Id而不同Group的意义就在相当于相同的目录下不同的文件，不同group直接的服务调用是只能通过额外config里配置
因此解决办法就是把nacos中的group的后缀都改成-project，本地配置中的也改了然后实在不行的话Gateway配置上再添加上lowerCaseServiceId: true
重启服务即可
