The guy with the oversized errorpage now sent me a list of applications he needs these pages configured for: 85 applications in all.
At first glance I can say some of these applications are not hosted with us; others are hosted but part of a larger application. Even with about half of them left, I will certainly not promise to configure them by tonight.
I went into BOfH-mode and asked him to provide me with a contact person who can decide what application should be deployed under which URL. Which is a necessary decision anyway, in my defense.