The module type constant for last resort modules is
MODULE_LAST.
mapping|int(0..1) last_resort(RequestID id)
The last_resort() method is called when all previous
modules have failed to return a response.
The id argument is the request information object associated with
the request.
The returned value is either zero, if you did not handle the
request, a response mapping or
the integer one, signifying that the request should be processed again
from start (used only by the Path info support module).
