Nginx HTTP basic auth with cookie pass

nginx.conf

map $cookie_skip_http_auth $auth_type {
        default "Restricted Area";
        "123" "off";
}

server {
        location /setauthcookie {
                add_header Set-Cookie "skip_http_auth=123";
                return 301 http://example.com;
        }

        location / {
                auth_basic $auth_type;
                auth_basic_user_file "/etc/nginx/auth.passwords";

                try_files $uri $uri/ =404;
        }
}