Sets the function used to resolve the proxy server to be used for
opening a HTTP connection to the specified
url. If this
function is not set, direct connections will always be used.
The string returned by
f must be in the format used by browser
PAC (proxy auto-config) scripts. That is either
for using a direct connection or
for using the proxy server
host on port
A configuration can contain several configuration elements separated by semicolons, e.g.
"PROXY host:port; PROXY host2:port2; DIRECT"
The static function findProxyFromEnvironment on this class can be used to implement proxy server resolving based on environment variables.
set findProxy(String f(Uri url));