This is my live example of permanent (301) redirection to external URL with Nginx, all incoming requests will be redirected to a Facebook group.

cat /etc/nginx/sites-enabled/domain.de

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server {
        server_name  domain.de www.domain.de;
	listen   [::]:80;
	server_tokens off;
 
location / {
	rewrite ^ http://www.facebook.com/groups/399191/ permanent;
}
 
}