Attention: Make sure to carefully check that your credentials and port number are correct for your auth type.
HTTPS
How to authenticate using HTTPS.
curl --proxy https://network.joinmassive.com:65535 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace
HTTP
How to authenticate using HTTP.
curl --proxy http://network.joinmassive.com:65534 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace
SOCKS5
How to authenticate using SOCKS5.
curl -x socks5h://network.joinmassive.com:65533 -U '{PROXY_USERNAME}:{API_KEY}' https://www.cloudflare.com/cdn-cgi/trace
Firewalled Ports
If port 65,535 is closed on your network, try port 1,080.
curl -x https://network.joinmassive.com:1080 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace