Comment by kvalekseev

HAProxy is a beautiful tool but it doesn't buffer requests that is why NGINX is recommended in front of gunicorn otherwise it's suspectible to slowloris attack. So either cloubhouse can be easily DDOS'd right now or they have some tricky setup that prevents slow post reqests reaching gunicorn. In the blog post they don't mention that problem while recommend others to try and replace NGINX with HAPRoxy.