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  1. or download this
    use CGI qw/:standard/;
use CGI::Validate;
  2. or download this
    my $variable =  param( "var" ) || "OFF";
  3. or download this
    if ($ENV{'REQUEST_METHOD'} eq "GET") {
    $request = $ENV{'QUERY_STRING'};
...
        || warn "Could not get query\n";
} 
##Then Save $request to file.