Nginx Reverse proxy

default.conf

server {
    listen 80;
    listen [::]:80;

    server_name test.com www.test.com;

    location / {
        proxy_pass  http://app1.com:80001;
    }
}

server {
    listen 80;
    listen [::]:80;

    server_name example.com www.example.com;

    location / {
        proxy_pass  http://app2.com:80002;
    }
}

Dockerfile

FROM nginx
COPY default.conf /etc/nginx/conf.d/default.conf