springcloud 2020 gateway 503 錯誤代碼

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.org-->
    <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。