Allow static or dynamic error pages

[HHHartmann]

The idea is to alter the filename of the request and remember, that it is an error url. and then reprocess it.
I am afraid this will require some refactoring
I would suggest to use a new name scheme for error pages to allow displaying them in unauthorized mode and prevent calling them directly
like
error/404.* for a 404 error and the like.

What do you think?

[marcoskirsch]

Customizable error pages seem like overkill for such a simple server but I'm not strongly opposed.
Storing them under "error/404.html" as you suggest sounds like the way to go to me.