finishConnect(..) failed: Connection refused: localhost/127.0.0.1 , error: Webflux, Webclient, Spring boot, java

I'm having this error while using webclient in localhost, can you help me guys ??

ERROR                  org.springframework.boot.autoconfigure.web.reactive.error.AbstractErrorWebExceptionHandler - [0e1ef5cd-1]  500 Server Error for HTTP G
ET "/product/spec/template/posts"
product      | io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: localhost/127.0.0.1:8090
product      |  Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
product      | Error has been observed at the following site(s):
product      |  |_ checkpoint ⇢ Request to GET http://localhost:8090/retailer/retailer/posts/12 [DefaultWebClient]
product      |  |_ checkpoint ⇢ Handler com.zucco.tech.hm.service.product.controller.ProductSpecTemplateController#posts() [DispatcherHandler]
product      |  |_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
product      |  |_ checkpoint ⇢ HTTP GET "/product/spec/template/posts" [ExceptionHandlingWebHandler]
product      | Stack trace:
product      | Caused by: java.net.ConnectException: finishConnect(..) failed: Connection refused
product      |  at io.netty.channel.unix.Errors.throwConnectException(Errors.java:124) ~[netty-transport-native-unix-common-4.1.51.Final.jar!/:4.1.51.Final]

No, we can not call direct by localhost, the term here is "container call container", so, we should call together by container name.

1. change the docker-compose like this:

> order-service:
> build: docker/order-service
> container_name: order-service
> ports:
> - 8082:8080

2. And then, in the client service, we just define host like below:

> private String hostname =
> "http://order-service:8080/order-service/welcome";

You can see, when we call order service by browser (real client), we call throught extend port (8082), but in case container call container, we should call by its containers name and it`s port (8080).

Connection refused means that there was no server listening on the address:port. You can check with netstat -tulpen what ports are open on which address.

I also had the same issue, while running my application, but I found out that the issue was that I had two micro-services that were having the same name in the application.yml.
Kindly confirm that all the micro-services you have defined have unique name and ports.