K8S: Routing with Istio return 404 - kubernetes

Question

I'm new in the k8s world.
Im my dev enviroment, I use ngnix as proxy(with CORS configs and with headers forwarding like ) for the different microservices (all made with spring boot) I have. In a k8s cluster, I had to replace it with Istio?
I'm trying to run a simple microservice(for now) and use Istio for routing to it. I've installed istio with google cloud.
If I navigate to IstioIP/auth/api/v1 it returns 404
This is my yaml file
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: gateway
spec:
selector:
istio: ingressgateway # use Istio default gateway implementation
servers:
- port:
name: http
number: 80
protocol: HTTP
hosts:
- '*'
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: virtual-service
spec:
hosts:
- "*"
gateways:
- gateway
http:
- match:
- uri:
prefix: /auth
route:
- destination:
host: auth-srv
port:
number: 8082
---
apiVersion: v1
kind: Service
metadata:
name: auth-srv
labels:
app: auth-srv
spec:
ports:
- name: http
port: 8082
selector:
app: auth-srv
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: auth-srv
spec:
replicas: 1
template:
metadata:
labels:
app: auth-srv
version: v1
spec:
containers:
- name: auth-srv
image: gcr.io/{{MY_PROJECT_ID}}/auth-srv:1.5
imagePullPolicy: IfNotPresent
env:
- name: JAVA_OPTS
value: '-DZIPKIN_SERVER=http://zipkin:9411'
ports:
- containerPort: 8082
livenessProbe:
httpGet:
path: /api/v1
port: 8082
initialDelaySeconds: 60
periodSeconds: 5

Answer 1

Looks like istio doesn't know anything about the url. Therefore you are getting a 404 error response.
If you look closer at the configuration in the virtual server you have configured istio to match on path /auth.
So if you try to request ISTIOIP/auth you will reach your microservice application. Here is image to describe the traffic flow and why you are getting a 404 response.