Massive ISP proxies support three protocols:
  1. HTTP (Port 8000):
curl --proxy http://isp.joinmassive.com:8000 -U '{PROXY_USERNAME}:{PROXY_PASSWORD}' https://cloudflare.com/cdn-cgi/trace
  1. HTTPS (Port 4080):
curl --proxy https://isp.joinmassive.com:4080 -U '{PROXY_USERNAME}:{PROXY_PASSWORD}' https://cloudflare.com/cdn-cgi/trace
  1. SOCKS5 (Port 8000):
curl -x socks5h://isp.joinmassive.com:8000 -U '{PROXY_USERNAME}:{PROXY_PASSWORD}' https://www.cloudflare.com/cdn-cgi/trace
Replace PROXY_USERNAME and PROXY_PASSWORD with your credentials.