url with host for which to lookup the proxy server
Details
The ie_proxy_info function looks
up your current proxy settings as configured in IE under "Internet Options"
> "Tab: Connections" > "LAN Settings". The ie_get_proxy_for_url
determines if and which proxy should be used to connect to a particular
URL. If your settings have an "automatic configuration script" this
involves downloading and executing a PAC file, which can take a while.