This page is used to test if LinkController is working. It shouldn't be visible on any server unless you are instaling and testing link-controller.
The fact that you are seeing this page indicates that the website you just visited is either trying to install LinkController or is experiencing problems.
If you would like to let the administrators of this website know that you've seen this page instead of the page you expected, you should send them e-mail. In general, mail sent to the name "webmaster" and directed to the website's domain may reach the appropriate person.
For example, if you experienced problems while visiting www.example.com, you should send e-mail to "webmaster@example.com".