I have a React frontend and a node.js backend. Each are in separate containers within separate Pods within the same cluster in k8's. I want to send data between them without having to use IP addresses. I know Kubernetes has a feature that lets you talk between pods inside the same cluster, and i think its related to the selector label defined within the Service files created.

I have created a ClusterIp service for my React app and another ClusterIp for my server. I have created an ingress file for my application. I know my ingress works as i can access my UI, and i can hit my health check endpoint of my server - so i know they are exposed to the outside world correctly. My problem is how to communicate internally within k8's

Within the my react app i have tried to write axios.post("/api/test", { value: "TestValue" }); But the endpoint within my server of api/test never gets hit with this.

Backend Server Cluster IP - - - - 
    
    

apiVersion: v1
kind: Service
metadata:
  name: server-model-cluster-ip-service
spec:
  type: ClusterIP
  selector:
    component: server-model
  ports:
    - port: 8050
      targetPort: 8050

React UI Cluster IP - - - - 
 apiVersion: v1 kind: Service metadata: name: react-ui-cluster-ip-service spec: type: ClusterIP selector: component: react-ui ports: - port: 3000 targetPort: 3000 


Ingress File - - - - -

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-service
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /$1
spec:
  rules:
    - http:
        paths:
          - path: /api/?(.*)
            backend:
              serviceName: react-ui-cluster-ip-service
              servicePort: 8050
          - path: /server/?(.*)
            backend:
              serviceName: server-model-cluster-ip-service
              servicePort: 8050

I understand the Label selector is what maps my React Cluster IP to the Deployment for my UI and similar for my Server Cluster IP to my Deployment for server. I thin i am right in saying i can use the selector somehow to send axis/http requests to other pods like..

axios.post("/PODNAME/api/test", { value: "TestValue" });

Could anyone tell me if i am completely wrong or missing something obvious please :)