This is a very good solution for development and test environments, but not for any production system due to security implications.
Recently, I wanted to configure an older Oracle Apache (included in the Oracle 9i release of the database).
It uses the older plsql configuration of the wdbsvr.app configuration file.
Here are the instructions on how to configure APEX with that OHS:
But how do you configure the DAD now to display the error messages directly?
You can use the following syntax for that:
The default is "WebServer".
See the instructions here: