It looks like you are trying to pass command line options via HTTP/CGI which will not work. You can pass parameters using hidden fields in your HTML form:

<form action="http://XXX/XXX/XXX/add-hosttest.pl" method="post">
<input type="hidden" name="server" value="server_name">
<input type="hidden" name="username" value="my_username">
<input type="hidden" name="view" value="view_name">
<input type="submit" name="sub" value="Run this!">
</form>
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Then, in your Perl script you can access them using the CGI module:

use CGI;
my $q = CGI->new;
my $server = $q->param('server');
my $username = $q->param('username');
my $dnsview = $q->param('view');
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