Attention: Make sure to carefully check that your credentials and port number are correct for your auth type.

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HTTP

How to authenticate using HTTP.
HTTP Port8000
curl --proxy http://isp.joinmassive.com:8000 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace

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HTTPS

How to authenticate using HTTPS.
HTTPS Port4080
curl --proxy https://isp.joinmassive.com:4080 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace

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SOCKS5

How to authenticate using SOCKS5.
SOCKS5 Port8000
curl -x socks5h://isp.joinmassive.com:8000 -U '{PROXY_USERNAME}:{API_KEY}' https://www.cloudflare.com/cdn-cgi/trace