Bad Gateway on Kubernetes cluster

Traefik Traefik v2
1

Hello,
I installed traefik on my cluster kubernetes with helm on the kube-system namespace.
I try to deploy my website with a deployment, service and ingress organised this way:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
  namespace: default
  labels:
    app: web
spec:
  replicas: 1
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      imagePullSecrets:
        - name: gitlab-log
      containers:
        - image: registry.gitlab.com/stikkit/website:latest
          imagePullPolicy: Always
          name: web
          ports:
            - containerPort: 8080

apiVersion: v1
kind: Service
metadata:
  name: web
  namespace: default
  labels:
    app: web
spec:
  type: ClusterIP
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: web

kind: Ingress
apiVersion: extensions/v1beta1
metadata:
  name:  web-ingress
  namespace: default
spec:
  rules:
  - http:
      paths:
      - path: /web
        backend:
          serviceName: web
          servicePort: 80

I get a bad gateway when I order: curl 195.154.70.142/web
(195.154.70.142 is the external ip of my traefik service)

kubectl version:
Client Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.3", GitCommit:"b3cbbae08ec52a7fc73d334838e18d17e8512749", GitTreeState:"clean", BuildDate:"2019-11-13T11:23:11Z", GoVersion:"go1.12.12", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.1", GitCommit:"206bcadf021e76c27513500ca24182692aabd17e", GitTreeState:"clean", BuildDate:"2020-09-09T11:18:22Z", GoVersion:"go1.15", Compiler:"gc", Platform:"linux/amd64"}

Helm version:
version.BuildInfo{Version:"v3.3.4", GitCommit:"a61ce5633af99708171414353ed49547cf05013d", GitTreeState:"clean", GoVersion:"go1.14.9"}