Eg:
Actual Posted URL:
/admin/settings/settings/prefix/Access%20Control
$_GET value:
/admin/settings/settings/prefix/Access_Control
Since $unsetUrl differs, the $_GET value will get copied in to
CakeRequest::$query, causing CakeRequest::here() to return:
/admin/settings/settings/prefix/Access%20Control?%2Fadmin%2Fsettings%2Fsettings%2Fprefix%2FAccess_Control=
This confuses SecurityComponent in the following line:
f23d811ff5/lib/Cake/Controller/Component/SecurityComponent.php (L514)