my $username = param "user";
     my $password = param "pass";

##</code><code>##

    $form = $cgi->parse_form_data;
    %form = $cgi->parse_form_data;

    # or

    $form = $cgi->parse_form_data ('GET', 'HEAD' or 'POST');

##</code><code>##

    my $query     = $req->parameters;

##</code><code>##

    my $form_field_value = $cgi->param('some_field_name');