Localhost connection refused in Docker development environment - php

Question

I use Docker for my PHP development environment, and I set up my images with Docker Compose this way:
myapp:
build: myapp/
volumes:
- ./myapp:/var/www/myapp
php:
build: php-fpm/
expose:
- 9000:9000
links:
- elasticsearch
volumes_from:
- myapp
extra_hosts:
# Maybe the problem is related to this line
- "myapp.localhost.com:127.0.0.1"
nginx:
build: nginx/
ports:
- 80:80
links:
- php
volumes_from:
- myapp
elasticsearch:
image: elasticsearch:1.7
ports:
- 9200:9200
Nginx is configured (in its Docker file) with a virtual host named myapp.localhost.com (server_name parameter) and that points to the /var/www/myapp folder.
All this works fine.
But here is my problem: my web app is calling itself via the myapp.localhost.com URL with cURL (in the PHP code), which can be more easily reproduced by running this command:
docker-compose run php curl http://myapp.localhost.com
The cURL response is the following:
cURL error 7: Failed to connect to myapp.localhost.com port 80: Connection refused
Do you have any idea on how I can call the app URL? Is there something I missed in my docker-compose.yml file?

Answer 1

Months later, I come back to post the (quite straightforward) answer to my question:
Remove the server_name entry in the Nginx host configuration
Remove the extra_hosts entry in docker-compose.yml file (not necessary, but it's useless)
Simply call the server with the Nginx container name as a host (nginx here):
docker-compose exec php curl http://nginx