I tried to set the value of "Allowed Hostnames" of APEX Instance but with a typo, after submitting, and the setting takes effect immediately, thus result in error: "404 Not found" returned by ORDS which is the one ORDS supposed to do, because the current hostname is not matched with the wrong one I just set.
And this means I have no longer the chance to change back the setting from the APEX user interface, is this setting saved in DB or somewhere in the file system that I could fix it manually?
The related document:
https://docs.oracle.com/en/database/oracle/application-express/21.1/aeadm/isolating-workspaces-in-an-instance.html#GUID-F66B9B79-3A68-49A9-A0D8-8363BDB56474