use warnings;
use strict;
use URI::Escape;

my $url = "http://192.168.1.50/cgi-bin/in%20dex.cgi?action=vi%20ew due to %20";
my $uri = uri_unescape($url);

print $uri;  # http://192.168.1.50/cgi-bin/in dex.cgi?action=vi ew due to