Simple javascript proof-of-work based access for Nginx with virtually no overhead.
Easy installation: just add load_module /path/to/ngx_http_js_challenge_module.so; to your nginx.conf file and follow the configuration instructions.
load_module /path/to/ngx_http_js_challenge_module.so;
nginx.conf
//todo
apt install libperl-dev libgeoip-dev libgd-dev libxslt1-dev