Are you sending it via a HTTP GET parameter? The "cleaner" way to do that would be with something like URI:

use URI;
my $uri = URI->new("http://www.foo.com/bar");
$uri->query_form( param_one => "hello+world&foo=bar",
  param_two => "blah" );
print "$uri\n";
# prints "http://www.foo.com/bar?param_one=hello%2Bworld%26foo%3Dbar&p
+aram_two=blah"
[download]