Sets Java's web proxy properties, so that tasks and code run in
the same JVM can have through-the-firewall access to remote web sites,
and remote ftp sites.
You can nominate an http and ftp proxy, or a socks server, reset the server
settings, or do nothing at all.
Examples
<setproxy/>
do nothing
<setproxy proxyhost="firewall"/>
set the proxy to firewall:80
<setproxy proxyhost="firewall" proxyport="81"/>
set the proxy to firewall:81
<setproxy proxyhost=""/>
stop using the http proxy; don't change the socks settings
<setproxy socksproxyhost="socksy"/>
use socks via socksy:1080
<setproxy socksproxyhost=""/>
stop using the socks server