nginx include example

proxy.conf

# /etc/nginx/custom/proxy.conf
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Protocol $scheme;
proxy_set_header X-Forwarded-Host $http_host;

ssl-YOURDOMAIN.conf

# /etc/nginx/custom/ssl-YOURDOMAIN.conf
listen [::]:443 ssl;
listen 443 ssl;
ssl_certificate /etc/letsencrypt/live/YOURDOMAIN/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/YOURDOMAIN/privkey.pem;
include /etc/letsencrypt/options-ssl-nginx.conf;
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

YOURDOMAIN

# /etc/nginx/sites-available/YOURDOMAIN
server {
  server_name your.domain;
  
  location / {
    proxy_pass http://localhost:PORT/;
    include /etc/nginx/custom/proxy.conf;
  }
  
  include /etc/nginx/custom/ssl-YOURDOMAIN.conf;
}