Setting up Virtualservice and Gateway for a Socket.io App

Networking
1

Hi,

We have a SocketIO app that we want to deploy to our cluster. We’re running on Istio 1.3.5. Whenever I port-forward the service of the socketio app, we were able to connect our client to it. But whenever we try connecting to the domain where its gateway is pointing, it gives us a “WebSocket is closed before the connection is established.”

I’ve seen posts like this where the app fails to maintain a connection when increasing the replica number, but in my case, even with only one pod deployed it still fails to establish a connection. What do you think is the problem of my setup? Below is my code for VS, Gateway and Destination Rule:

Gateway:

    apiVersion: networking.istio.io/v1alpha3
    kind: Gateway
    metadata:
      name: allocator-gateway
      namespace: default
    spec:
      selector:
        istio: ingressgateway
      servers:
      - hosts:
        - <domain here>
        port:
          name: https-allocator
          number: 8080
          protocol: HTTPS
        tls:
          credentialName: allocator-cert
          mode: SIMPLE
          privateKey: sds
          serverCertificate: sds

Virtualservice:

    apiVersion: networking.istio.io/v1alpha3
    kind: VirtualService
    metadata:
      name: allocator-vs
      namespace: default
    spec:
      gateways:
      - allocator-gateway
      hosts:
      - <domain here>
      http:
      - match:
        - uri:
            prefix: /
        route:
        - destination:
            host: abc-allocator
            subset: v1
            port:
              number: 8080
          weight: 100
        - destination:
            host: abc-allocator
            subset: v2
            port:
              number: 8080
          weight: 0
        websocketUpgrade: true

Destination Rule:

    apiVersion: networking.istio.io/v1alpha3
    kind: DestinationRule
    metadata:
      name: allocator-dr
    spec:
      host: abc-allocator
      subsets:
      - name: v1
        labels:
          version: v1
      - name: v2
        labels:
          version: v2

Any help to this will be appreciated. Thanks!