I use your IT Hit WebDAV server and I try to send 'failed' response on delete request to Mini-Redirector (Microsoft WebDAV client). I checked all available 'failed response' (401, 402, 423) and I see that Mini-Redirector ignores it (file/directory is deleted and restored on refresh).
Do you know how it should be handled to prevent delete file/directory on Mini-Redirector side?
As far as we know Mini-Redirector's reaction to response codes is undocumented. From our experience it just ignores any response codes.