POM文件依赖

<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>

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我在父组件中退出的nacos的相干依赖如下：

<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>

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nacos的版本如下：

<properties>

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

</properties>

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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: 
      predicates:
        - Path=/**
nacos:
  discovery:
    server-addr: localhost:8848
    metadata:
      preserved.heart.beat.interval: 3 #心跳距离。工夫单位:秒。心跳距离
      preserved.heart.beat.timeout: 6 #心跳暂停。工夫单位:秒。 即服务端6秒收不到客户端心跳，会将该客户端注册的实例设为不衰弱：
      preserved.ip.delete.timeout: 9 #Ip删除超时。工夫单位:秒。即服务端9秒收不到客户端心跳，会将该客户端注册的实例删除：

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当我通过uri: 去调用服务时，是能够调用的，然而当我用uri lb://consumer时就无奈调用服务，报错503.

解决办法是：
退出feign依赖。

<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组件 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-lowww.diuxie.comadbalancer</artifactId>
    <version>3.0.2</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

</dependencies>

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猜想起因：nacos兼容feign，feign集成ribbon，默认实现负载平衡；或者是nacos不兼容springcloud gateway自带的ribbon。