ribbon.eureka.enabled=true not working in Zuul Gateway - spring-boot

Question

application.properties :-
spring.application.name=zuulgateway
management.endpoints.web.exposure.include=*
zuul.routes.clientone.path=/clientone/**
zuul.routes.clientone.service-id=clientone
ribbon.eureka.enabled=true
#clientone.ribbon.listOfServers = http://localhost:8001
zuul.ignored-services=*
logging.level.org.springframework=DEBUG
eureka.client.register-with-eureka=true
eureka.client.fetch-registry=true
server.port=8000
eureka.client.service-url.defaultZone=http://localhost:8761/eureka
build.gradle :-
plugins {
id 'org.springframework.boot' version '2.4.4'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter'
implementation group: 'org.springframework.cloud', name: 'spring-cloud-starter-netflix-zuul', version: '2.2.7.RELEASE'
implementation group: 'org.springframework.cloud', name: 'spring-cloud-starter-netflix-eureka-client', version: '3.0.2'
implementation group: 'org.springframework.cloud', name: 'spring-cloud-starter-config', version: '3.0.3'
implementation group: 'org.springframework.cloud', name: 'spring-cloud-starter-bootstrap', version: '3.0.2'
}
ext {
springCloudVersion = '2020.0.0'
}
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
}
}
Main class :-
#EnableZuulProxy
#EnableDiscoveryClient
#SpringBootApplication
public class ZuulGatewayApplication {
public static void main(String[] args) {
SpringApplication.run(ZuulGatewayApplication.class, args);
}
}
When I try to access endpoint present in clientone service I'm getting error like
Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: clientone
Error :-
021-04-04 20:19:30.811 DEBUG 24288 --- [nio-8000-exec-4] o.s.c.n.zuul.filters.SimpleRouteLocator : route matched=ZuulRoute{id='clientone', path='/clientone/**', serviceId='clientone', url='null', stripPrefix=true, retryable=null, sensitiveHeaders=[], customSensitiveHeaders=false, }
2021-04-04 20:19:30.816 WARN 24288 --- [nio-8000-exec-4] o.s.c.n.z.filters.post.SendErrorFilter : Error during filtering
com.netflix.zuul.exception.ZuulException: Forwarding error
at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:198) ~[spring-cloud-netflix-zuul-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:173) ~[spring-cloud-netflix-zuul-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:119) ~[spring-cloud-netflix-zuul-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:117) ~[zuul-core-1.3.1.jar:1.3.1]
When I uncomment clientone.ribbon.listOfServers in properties file getting success response. Then what is the use of this ribbon.eureka.enabled=true property if I provide list of servers.