Safe place for html pages

[marc]

thanks for your answer,
well unfortunately I am not able to let GetSimple handle the 404 errors even when I try your possibilities.
sure, there is something I am doing wrong...
I'll seek further
thanks again for your help

EDIT :
it works...
but the problem was elsewhere :
the data/other/logs/404monitoring.log.xml file was broken (invalid xml error in the admin panel website health check)
for an unknown reason the </channel> tag was broken
and the 404 errors results were a blank screen