BMX Handler property is set to http://localhost:port/bmx by default.
You can have set localhost to different adrreses in /etc/hosts.
For example:
127.0.0.1 localhost
::1 localhost

So the default JON Httpd settings will not work with httpd set to 127.0.0.1.

Set BMX Handler property to http://127.0.0.1:port/bmx by default.
We should also fix the default mod_bmx configuration for using with JON Httpd plugin. See ma prposed configuratrion in attachment.