Communication between multiple hosts of nginx in docker-compose - docker

Question

I have a docker-compose like this:
version: "3"
networks:
LEMP:
services:
nginx:
image: nginx:latest
ports:
- "8080:80"
- "80:80"
- "443:443"
- "3333:3333"
volumes:
- /var/www:/var/www
- ./nginx-conf/server1.local.conf:/etc/nginx/conf.d/server1.local.conf
- ./nginx-conf/server2.local.conf:/etc/nginx/conf.d/server2.local.conf
depends_on:
- php
networks:
- LEMP
extra_hosts:
- "server1.local:127.0.0.1"
- "server2.local:127.0.0.1"
php:
build: ./php
restart: always
volumes:
- /var/www:/var/www
ports:
- "9000:9000"
networks:
- LEMP
mysql:
image: mysql:5.7
restart: always
ports:
- "3306:3306"
depends_on:
- nginx
environment:
- MYSQL_ROOT_PASSWORD=my_password
volumes:
- db:/var/lib/mysql
networks:
- LEMP
redis:
image: redis:alpine
restart: always
ports:
- "6379:6379"
networks:
- LEMP
volumes:
db:
PHP Dockerfile:
FROM php:7.1-fpm
RUN docker-php-ext-install pdo pdo_mysql
WORKDIR /var/www
If I try to reach server1.local or server2.local from my browser / postman it works fine, but if I try to reach server2.local (REST api) from server1.local, it can't reach it.
I read this discussion but of course I can't use my PC IP since the configuration will be shared to other colleagues.
I know nginx-proxy, but this last one requires to setup other services where projects are, but in my case I have only git projects stored in /var/www/, so how should I setup them starting from a folder in /var/www? For example, server2.local has both php and an internal reverse proxy for a local host (localhost:3333). Should I start from php image, install node.js/pm2, run them and so on? It seems a bit weird to me.