Nginx example configuration (/etc/nginx/sites-available/yourdomain)

yourdomain

server {
	listen 80;
	listen [::]:80 ipv6only=on;
	server_name yourdomain.top www.yourdomain.top;
	location /.well-known/ {
		allow all;
	}
	location / {
		rewrite ^(.*) https://yourdomain.top$1 permanent;
	}
}

server {
	listen 443	ssl;
	listen [::]:443 ipv6only=on ssl;
	server_name	yourdomain.top;
	ssl_certificate	/etc/letsencrypt/live/yourdomain.top/fullchain.pem;
	ssl_certificate_key /etc/letsencrypt/live/yourdomain.top/privkey.pem;
	ssl_protocols	TLSv1 TLSv1.1 TLSv1.2;
	ssl_ciphers	HIGH:!aNULL:!MD5;
	root	/var/www/html;
	location / {
		error_page 404 =404 /404.html;
	}
	location /searsia/ {
		proxy_pass http://localhost:16842/searsia/;
	}
}