reverse download nginx proxy

gistfile1.txt

server{
        listen 80 default_server;
        listen [::]:80 default_server;
        allow 1.2.3.4; # whitelist server
        deny all;
        location / {
                return 403;
        }
        location ~/i/(?<rdomain>[a-zA-Z0-9-\.]+)/ {
                rewrite /i/([a-zA-Z0-9-\.]+)/(.*) /$2  break;
                proxy_http_version 1.1;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $rdomain;
                proxy_buffering off;
                proxy_pass http://$rdomain;
        }
        location ~/s/(?<rdomain>[a-zA-Z0-9-\.]+)/ {
                rewrite /s/([a-zA-Z0-9-\.]+)/(.*) /$2  break;
                proxy_http_version 1.1;
                proxy_buffering off;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $rdomain;
                proxy_pass https://$rdomain;
        }

}