CUPS URL changes

[Paul Goodman]

How do I prevent the URL from changing in the web interface when I perform administrative actions? Here's what happens:

I open a browser and go to http://localhost:631. Then I click the "Administration" tab. I am prompted for a user name and password, which I enter and log in successfully. Then I click "Manage Printers" and am taken to http://localhost:631/printers. I choose a queue at random and click on "Stop Printer" at which point the url changes from localhost:631 to the server name:631. In other words:
http://<nameofcupsserver>:631/admin/?op=stop-printer&printer_name=<printer>

And I get the message:
Forbidden
You don't have permission to access the resource on this server.

If I edit the URL above and change the FQDN of the server to localhost again (but leave everything the same) the action is successful, but why does it keep changing the URL and how can I prevent this behavior?