Docker - React app not reachable with nginx - node.js

Question

I have backend express js, frontend react js . Express api reachable but not React
===> React Dockerfile :
FROM node:16 as client-build
WORKDIR /front
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build
EXPOSE 80
# Setup the server
FROM nginx
WORKDIR /front
COPY nginx.conf /etc/nginx/nginx.conf
COPY --from=client-build /front/dist /usr/share/nginx/html
CMD ["nginx", "-g", "daemon off;"]
===> Backend Dockerfile :
FROM node:16
WORKDIR /back
COPY package*.json ./
RUN npm install
COPY . .
CMD npm run start
===> docker-compose :
version: "3.8"
services:
mongodb:
image: mongo:3.6.8
restart: unless-stopped
ports:
- "27017:27017"
volumes:
- db:/data/db
networks:
- backend
back:
depends_on:
- mongodb
build: ./back
ports:
- "9000:9000"
networks:
- backend
- frontend
restart: on-failure
front:
depends_on:
- back
build: ./front
ports:
- "80:9001"
networks:
- frontend
restart: unless-stopped
volumes:
db:
driver: local
networks:
backend:
frontend:
I use docker on windows ps and on ubuntu server, both results are same.
localhost:9000 or domain.com:9000 - backend reachable
but localhost / localhost:9001 / domain.com / domain.com / 9001 not reachable
Only when i run a curl on terminal with local ip (that i got from docker 192.172****) i get result but not from outside
I'm new at docker. My goal is make the frontend accessable via domain and api private. But for the very next step all i need is to access frontend via browser.
===> Nginx conf
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
#tcp_nopush on;
keepalive_timeout 65;
#gzip on;
server {
listen 80;
server_name _;
location / {
root /usr/share/nginx/html;
index index.html index.htm;
try_files $uri $uri/ /index.html =404;
}
location /api/ {
proxy_pass http://back:9000/api/;
}
}
}