How can i auto get form's data for perl6?

a form like this:

<form action='1.php' method='post'>
u:<input name='u' type='text'/><br />
p:<input name='p' type='password'/><br />
<input value='submit' type='submit'/>
</form>

and how can i auto get the form data use perl6? lkie this:

my $form = xxx($the_form_url)

and the result like this:

$form.Str
#output like that:
#u=username&p=password&submit=submit

have shome modules in perl6? please..