upstream backend  {
       server 192.168.1.51:8069;
       server 192.168.1.52:8069;
       server 192.168.1.53:8069;
       server 192.168.1.54:8069;
}

upstream backend-longpolling {
server 192.168.1.51:8072;
server 192.168.1.52:8072;
server 192.168.1.53:8072;
server 192.168.1.54:8072;
}

server {
   server_name xyz.com www.xyz.com;

   location / {
       return 301 https://$server_name$request_uri;
    }
}




server {
listen          443 ssl;

server_name xyz.com www.xyz.com;
proxy_connect_timeout       60000;
proxy_send_timeout          60000;
proxy_read_timeout          60000;
send_timeout                60000;

ssl_dhparam /etc/ssl/certs/dhparam.pem;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_intercept_errors on;

location /longpolling {
     proxy_pass http://backend-longpolling;
}

location / {
          proxy_pass http://backend;
}

ssl_certificate /etc/nginx/ssl/www_xyz_com.crt; 
ssl_certificate_key /etc/nginx/ssl/www_xyz_com.key;
}