black-lists:
    1: "http://proxycheck.io/v2/%ip%"

  #The detect content. Plugin will search for this words in return data.
  #If return will CONTAIN (not equal) this string, connection will be dropped on pre-login stage.
  #Use same special ID to match URL (black-lists) with return (detect-content).
  detect-content:
    1: '"proxy": "yes"'