in reply to How do I include plus signs in POST LWP request

If you use HTTP::Request::Common it will handle this for you: 
use HTTP::Request::Common;
my $ua = LWP::UserAgent->new;
$ua->request(POST $url, [DataOne => 'A', DataTwo => '1+', DataThree =>
+ 20]);

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gav^

In Section Seekers of Perl Wisdom