# nginx -t
nginx: [emerg] "client_max_body_size" directive is duplicate in /home/dokku/default/nginx.conf.d/upload.conf:1

# head -n 15 nginx.conf

server {
  listen      [::]:80;
  listen      80;
  server_name example.com;
  access_log  /var/log/nginx/default-access.log;
  error_log   /var/log/nginx/default-error.log;

  include /home/dokku/default/nginx.conf.d/*.conf;
  location / {
    return 301 https://$host:443$request_uri;
  }

  include /home/dokku/default/nginx.conf.d/*.conf;
}