Spring Cloud API Gateway routing not working - spring-boot

Question

I have designed a micro service prototype using below technologies
Eureka Server
a service
Spring Cloud API Gateway
Above mentioned service are registered in the Eureka Server
API Gateway routing Configuration
server.port=8080
eureka.client.serviceUrl.defaultZone = http://localhost:8083/eureka
spring.application.name=ApiGateway
spring.cloud.gateway.discovery.locator.enabled=true
spring.cloud.gateway.discovery.locator.lower-case-service-id=true
spring.cloud.gateway.routes[0].id=service1
spring.cloud.gateway.routes[0].uri=lb://MICROSERVICE1
spring.cloud.gateway.routes[0].predicates[0]=Path=/service1/**
The service Configuration
server.port=8081
server.address=127.0.0.1
eureka.client.serviceUrl.defaultZone = http://localhost:8083/eureka
spring.application.name=MicroService1
error.whitelabel.enabled= false
Controller
#RestController
#RequestMapping("/service1")
public class HomeController {
#GetMapping("/message")
public String hello() {
return "response from micro service1";
}
}
When I send a request to the gateway it's showing the below error
2020-12-16 22:26:09.770 ERROR 16700 --- [ctor-http-nio-3] a.w.r.e.AbstractErrorWebExceptionHandler : [d3334561-1] 500 Server Error for HTTP GET "/service1/message"
java.net.UnknownHostException: failed to resolve 'LAPTOP-KU56B6A8' after 3 queries
at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1013) ~[netty-resolver-dns-4.1.55.Final.jar:4.1.55.Final]
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ HTTP GET "/service1/message" [ExceptionHandlingWebHandler]
How can we solve the above issue?

Answer 1

Add eureka.instance.hostname=localhost in both the microservices instances this will work and not give an error

Answer 2

i have modified the API Gate Way routing Configuration like below
spring.cloud.gateway.routes[0].id=service1
spring.cloud.gateway.routes[0].uri=http://localhost:8081/service1/
spring.cloud.gateway.routes[0].predicates[0]=Path=/service1/**
Now is working fine

Answer 3

Add this bean in your API gateway and you are good to go.
#Bean
public HttpClient httpClient() {
return HttpClient.create().resolver(DefaultAddressResolverGroup.INSTANCE);
}

Answer 4

Add below to both gateway and individual microservice fix the issue
eureka.instance.hostname=localhost
eureka.client.serviceUrl.defaultZone=http://${eureka.instance.hostname}:8010/eureka/

Answer 5

Add in your application.properties:
spring.cloud.discovery.enabled=true

Answer 6

I have modified my .yaml file with this configuration.
Issue resolved for me.
**server:
port: 9999
spring:
application:
name: gateway-ws
cloud:
gateway:
discovery:
locator:
enabled: true
routes:
- id: userService
uri: http://user-service/
predicates:
- Path=/user/**
- id: contactService
uri: http://contact-service/
predicates:
- Path=/contact/**
eureka:
client:
service-url:
defaultZone: http://localhost:8085/eureka**

Answer 7

This is the only solution works among all of the answers above.
#Bean
public HttpClient httpClient() {
return HttpClient.create().resolver(DefaultAddressResolverGroup.INSTANCE);
}
This is the default behavior, so no effect.
spring.cloud.discovery.enabled=true
This has nothing to do with the discovery client.
It is related with the discovery server.
eureka.instance.hostname=localhost
So if you don't know, just don't mess it up with wrong directions.

Answer 8

hello jebji if you still have this problem
add
spring.cloud.discovery.enabled=true
in application.properties

Answer 9

Only Add the following property into your API gateway:
spring.cloud.discovery.enabled=true
Make sure you already added DevTool maven dependency into your API gateway project but if not then restart it.

Answer 10

add flowing property in application.property file of all eruka client microservice and api gateway , i face same issue and resolve doing same activity
spring.cloud.discovery.enabled=true
spring.cloud.gateway.discovery.locator.lower-case-service-id= true
spring.cloud.gateway.discovery.locator.enabled= true
eureka.instance.hostname=localhost

Answer 11

after adding all the above properties then also if you are facing issue then try the below one,
don't use lb://albums_service , but use lb://albums-service .Because URI don‘t support underline.

Answer 12

You can add the following in application.yml file
spring:
cloud:
gateway:
routes:
- id: test-service
uri: lb://MICROSERVICE1
predicates:
- Path=/microservice1/**
filters:
- RewritePath=/microservice1/(?<segment>.*), /$\{segment}
with this it should works.
Like let say if your microservice1 is url is
localhost:8081/service1/message
then you can define the base path of your microservice1 in api-gateway by setting up the path as i did in above configuration.

Answer 13

The error message is "failed to resolve 'LAPTOP-KU56B6A8'".
This is an DNS issue.
You can set eureka.instance.prefer-ip-address=true in the service.
So it will register with its ip at Eureka and the DNS issue can be avoided.
This is actually the same issue as this QUESTION.
With this ANSWER