failed connect (nginx with docker) - docker

Question

I'm getting this failed to connect issues when it comes to communicating with other docker containers e.g Java server end.
This is the issue I'm getting
nginx_1 | 2019/12/14 17:39:47 [error] 6#6: *2 connect() failed (111:
Connection refused) while connecting to upstream, client: 172.19.0.1,
server: , request: "GET /api/cards HTTP/1.1", upstream:
"http://172.19.0.4:80/api/cards", host: "localhost", referrer:
"http://localhost/"
Here is my Docker-Compose configuration (docker-compose.development.yml)
version: '3'
services:
auth:
build:
context: ./auth
dockerfile: dev.Dockerfile
volumes:
- ./auth:/var/app
- ~/.gradle/:/root/.gradle/
client:
build:
context: ./client
dockerfile: dev.Dockerfile
volumes:
- ./client:/var/app/
- /var/app/node_modules
server:
build:
context: ./server
dockerfile: dev.Dockerfile
volumes:
- ./server:/var/app/
- ~/.gradle/:/root/.gradle/
nginx:
image: nginx
volumes:
- ./server.dev.conf:/etc/nginx/conf.d/default.conf
ports:
- "80:80"
depends_on:
- auth
- client
- server
Here is my nginx docker configuration (server.dev.conf)
server {
listen 80;
location /login/ {
proxy_pass http://auth:80/login/;
}
location /api/ {
proxy_pass http://server:80/api/;
}
location /resource/ {
proxy_pass http://server:80/resource/;
}
location / {
proxy_pass http://client:80;
rewrite ^/home/.*$ / last;
}
}
Remind you this is for our development hosted locally. The production version uses SSL