*google.com
- don't send HTTP / HTTPS requests to Google;google.com:443
- google.com:443 - don't send HTTPS requests to Google, but send HTTP requests to Google;google.com:443, yahoo.com:80
- google.com:443, yahoo.com:80 - don't send HTTPS requests to Google, but send HTTP requests to Yahoo!*
- ignore the https_proxy / http_proxy environment variables.