Step 3 - OpenID checks the Claimed URL with the OpenID Server 

my $check_url = $claimed->check_url(
    return_to  => 'http://staging.kapiti.geek.nz/openid/check.html',
    trust_root => 'http://staging.kapiti.geek.nz/'
);

• asks if the 'trust_root' can be told if 'http://openid' is your ID URL

• redirects to the 'return_to' URL (with lots of extra parameters)