Client-based tags (neu in 3.0.25 beta)

Definition in config:

  client-specific-tag no-CONNECT-whitelist \
    Don't block CONNECT requests to destinations that aren't white-listed

  client-specific-tag no-POST-whitelist \
    Don't block POST requests to destinations that aren't white-listed

  client-specific-tag forward-through-ssh \
    Forward all requests through SSH connection