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#!/usr/bin/perl

...
my $a = new LWP::UserAgent();
$a->proxy('http', 'http://ofgfw1.owfg.com:8080/');
$a->get("http://mysite.com/");

my $url='mysite.com';
$ua->cookie_jar(HTTP::Cookies->new(file => "lwpcookies.txt", autosave 
+=> 1));
...
$req->content_type('application/x-www-form-urlencoded');
$req->content($data);
$res = $ua->request( $req );

$ua->proxy('http', 'http://ofgfw1.owfg.com:8080/'); #???!!!