Example reverse proxy nginx

worker_processes 1;
events { worker_connections 1024; }
http {
  
    #force webmail.example to use ssl  
    server {
        listen 80;
        server_name  webmail.example.org;
        return 301 https://webmail.example.org$request_uri;
    }
      
    #webmail.example main entry
    server {
        listen 443 ssl;
        server_name  webmail.example.org;
          
        ssl_certificate /opt/certs/webmail.example.org.crt;
        ssl_certificate_key /opt/certs/webmail.example.org.key;
  
        location / {
            proxy_pass http://internalhost1:81/;
            proxy_set_header  X-Real-IP  $remote_addr;
        }
    }
  
    #Calibre server
    server {
        listen 80;
        server_name  b.example.org;
        location / {
            proxy_pass http://internalhost1:8080/;
            proxy_set_header  X-Real-IP  $remote_addr;
        }
    }
      
    #force wiki.example to use ssl  
    server {
        listen 80;
        server_name  wiki.example.org;
        return 301 https://wiki.example.org$request_uri;
    }
      
    #wiki.example main entry
    server {
        listen 443 ssl;
        server_name  wiki.example.org;
          
        ssl_certificate /opt/certs/wiki.example.org.crt;
        ssl_certificate_key /opt/certs/wiki.example.org.key;
  
        location / {
            proxy_pass http://internalhost1:8090/;
            proxy_set_header  X-Real-IP  $remote_addr;
        }
    }
 
    #Plex server
    server {
        listen 80;
        server_name  p.example.org;
        location / {
            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_redirect off;
            proxy_pass http://internalhost2:32400;
        }
    }
 
    #Minecraft Overviewer map
    server {
    listen 80;
    server_name  mc.example.org;
        location / {
            proxy_pass http://internalhost3:25566/;
            proxy_set_header  X-Real-IP  $remote_addr;
        }
    }
 
 
}