How to config nginx to request multiples microservices on node - node.js

Question

I'm trying to configure nginx to manage all request and redirect to proper microservice on node/express. All microservices works fine, connecting to Redis and Postgres.
I would like to manage without use ports on URL something like...
http://localhost/auth (dockerized microservice 1)
http://localhost/banks (dockerized microservice 2)
http://localhost/users (dockerized microservice 3)
I'm currently using Docker with multiples images, here's most relevant files..
Any idea? Thanks!
docker-compose.yml
version: '3'
services:
nginx:
build: ./nginx
links:
- auth:auth
- banks:banks
- users:users
ports:
- "80:80"
amplify:
build: ./docker-nginx-amplify
environment:
- API_KEY=
- AMPLIFY_IMAGENAME=development
auth:
build: ./api-auth
environment:
- PG_SERVER=172.19.0.3
links:
- redis
- postgres
- banks
ports:
- "8888"
banks:
build: ./api-banks
environment:
- PG_SERVER=172.19.0.3
links:
- redis
- postgres
ports:
- "8888"
users:
build: ./api-users
environment:
- PG_SERVER=172.19.0.3
links:
- redis
- postgres
ports:
- "8888"
redis:
image: redis
ports:
- "6379"
postgres:
image: postgres
hostname: postgres
ports:
- "5432:5432"
environment:
POSTGRES_USER: postgresuser
POSTGRES_PASSWORD: postgresuser
POSTGRES_DB: privatedatabase
restart: unless-stopped
nginx.conf
worker_processes 4;
events { worker_connections 1024; }
http {
upstream node-app {
least_conn;
server auth:8888 weight=10 max_fails=3 fail_timeout=30s;
server banks:8888 weight=10 max_fails=3 fail_timeout=30s;
server users:8888 weight=10 max_fails=3 fail_timeout=30s;
}
server {
listen 80;
location / {
proxy_pass http://node-app;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}
}