Nginx Domain name based routing

nginx.conf

worker_processes 4;
events { worker_connections 1024; }
http {
       upstream app1 {
             least_conn;
             server app:3000 weight=10 max_fails=3 fail_timeout=30s;
       }
       upstream app2 {
             least_conn;
             server api:4000 weight=10 max_fails=3 fail_timeout=30s;
       }
  


       server {
             listen 80;
             servername app1.lvh.me
            location / {
               proxy_pass http:/app1;
               proxy_http_version 1.1;
               proxy_set_header Upgrade $http_upgrade;
               proxy_set_header Connection 'upgrade';
               proxy_set_header Host $host;
               proxy_cache_bypass $http_upgrade;
             } 
             }


       server {
             listen 80;
             servername app2.lvh.me

             location / {
               proxy_pass http://app2;
               proxy_http_version 1.1;
               proxy_set_header Upgrade $http_upgrade;
               proxy_set_header Connection 'upgrade';
               proxy_set_header Host $host;
               proxy_cache_bypass $http_upgrade;
             }
       }
}