Nginx configuration to deploy Node application in subdomain

pet-project.conf

upstream pet_project {
  server localhost:3000;
}

server {
  listen 80;
  server_name pet-project.myhost;

  location / {
    alias /opt/demo/pet-project/public/;
    try_files $uri @pet-project;
  }

  location @pet-project {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $proxy_host;
    proxy_set_header X-NginX-Proxy true;

    proxy_pass http://pet_project;
  }
}