spring cloud 2020 gateway 報錯503

POM文件依賴

<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <!--gateway fhadmin.org--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-gateway</artifactId> <version>3.0.2</version> </dependency> <!--spring-boot fhadmin.org--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> 

我在父組件中加入的nacos的相關依賴如下：

<dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId> <version>${nacos.version}</version> </dependency> <!--alibaba fhadmin.org--> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> <version>${nacos.version}</version> </dependency> 

nacos的版本如下：

<properties> <nacos.version>2021.1</nacos.version> </properties> 

gateway的application.yml文件配置如下：

#fhadmin.org
server:
  port: 9040

spring:
  application:
    name: gateway
  cloud:
    gateway:
      routes:
        - id: consumer
          uri: lb://consumer
          #          uri: http://localhost:9010
          predicates:
            - Path=/**
    nacos:
      discovery:
        server-addr: localhost:8848
        metadata:
          preserved.heart.beat.interval: 3 #心跳間隔。時間單位:秒。心跳間隔
          preserved.heart.beat.timeout: 6 #心跳暫停。時間單位:秒。 即服務端6秒收不到客戶端心跳，會將該客戶端注冊的實例設為不健康：
          preserved.ip.delete.timeout: 9 #Ip刪除超時。時間單位:秒。即服務端9秒收不到客戶端心跳，會將該客戶端注冊的實例刪除：

當我通過uri: http://localhost:9010去調用服務時，是可以調用的，但是當我用uri lb://consumer時就無法調用服務，報錯503.

解決辦法是：
加入feign依賴。

<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-gateway</artifactId> <version>3.0.2</version> </dependency> <!--fegin組件 fhadmin.cn--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> <version>3.0.2</version> </dependency> <!-- Feign Client for loadBalancing --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-loadbalancer</artifactId> <version>3.0.2</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> 

猜測原因：nacos兼容feign，feign集成ribbon，默認實現負載均衡；或許是nacos不兼容springcloud gateway自帶的ribbon。