Dockerize MERN stack using traefik - docker

Question

I did follow this tutorial : https://rafrasenberg.com/posts/docker-container-management-with-traefik-v2-and-portainer/ to build a treafik reverse proxy on my server
And I tested it with a very simple application that render a "hello world" in a index.html:
version: "3"
services:
app:
image: nginx
environment:
PORT: ${PORT}
volumes:
- .:/usr/share/nginx/html/
networks:
- proxy
- default
labels:
- "traefik.enable=true"
- "traefik.docker.network=proxy"
- "traefik.http.routers.app-secure.entrypoints=websecure"
- "traefik.http.routers.app-secure.rule=Host(`my-test.localhost`)"
networks:
proxy:
external: true
it works!
Now I want to go on the next step and use it to build a MERN stack project and I'm a bit lost.
usually I dockerize a mern stack by:
create a dockerfile in /server
create a dockerfile in /client
create a docker-compose on the root directory
version: "3.7"
services:
server:
build:
context: ./server
dockerfile: Dockerfile
image: myapp-server
container_name: myapp-node-server
command: /usr/src/app/node_modules/.bin/nodemon server.js
volumes:
- ./server/:/usr/src/app
- /usr/src/app/node_modules
ports:
- 5000
depends_on:
- mongo
env_file: ./server/.env
environment:
- NODE_ENV=development
networks:
- app-network
- proxy
mongo:
image: mongo
volumes:
- data-volume:/data/db
ports:
- 27017
networks:
- app-network
- proxy
client:
build:
context: ./client
dockerfile: Dockerfile
image: myapp-client
container_name: myapp-react-client
command: npm start
volumes:
- ./client/:/usr/app
- /usr/app/node_modules
depends_on:
- server
ports:
- 3001
networks:
- app-network
labels:
- "traefik.enable=true"
- "traefik.docker.network=proxy"
- "traefik.http.routers.app2-secure.entrypoints=websecure"
- "traefik.http.routers.app2-secure.rule=Host(`test.localhost`)"
networks:
app-network:
driver: bridge
proxy:
external: true
volumes:
data-volume:
node_modules:
web-root:
driver: local
But seems that my proxy not working because the console doesn't return any error and it works on localhost:3000 but on test.localhost I have a "Gateway Timeout" error