proxy.pac

function FindProxyForURL(url, host) {
  // URLs within this network are accessed through
  // port 8080 on fastproxy.example.com:
  if (isInNet(host, "10.20.3.205", "255.255.0.0")) {
    return "SOCKS 127.0.0.1:50001";
  }

  if (isInNet(host, "192.168.150.3", "255.255.0.0")) {
    return "SOCKS 127.0.0.1:50001";
  }

  // All other requests go through port 8080 of proxy.example.com.
  // should that fail to respond, go directly to the WWW:
  return "DIRECT";
}