Test (ping) proxies
If you want to make sure that your proxies are working fine, you can do so in your computer's terminal with a command-line tool cURL. Type the one you need into your domain:port field:
curl -U user:pass -x domain:port https://www.whatismyip.com/
For example, any location with fast rotating session:
curl -U username:password -x any.metrow.com:8000 https://www.whatismyip.com/
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