Need Help Installing Kobo on my Own Server

You need to fix your nginx configuration, this is the configuration I used:

server{
  server_name kc.xxx.com kc.xxx.com ee.xxx.com;
   access_log  /var/log/nginx/kobo.access.log;
   error_log  /var/log/nginx/kobo.error_log;
   listen 80;
   client_max_body_size 100M;
   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_set_header        X-Forwarded-Proto $scheme;
             proxy_pass              http://127.0.0.1:8080$request_uri;
             proxy_read_timeout  90;
    }
}

After setting the configuration you need to get your SSL Certificates for your nginx, I recommend you to use Let’s Encrypt with Certbot, its quite easy to get https with that. Then you’re ready to proceed with the installation.