Auth Redirect and GET Variables

If this topic is covered specifically on these forums or elsewhere, I'm not finding it. 

The problem is: I'm using a URL for a component of my site that looks like this:

http://example.com/carts/weblines?co=1234567890

This is an operation that only authenticated users can perform. So, if they're not yet authenticated, they get redirected to the login form. Upon successful login, CakePHP should be redirecting them back to where they came from.

Which it is, after a fashion. However, it is dropping the GET variables off the end of the URL. Is there a way to prevent this from happening?

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