Using a Single HTTP Server for Multiple APEX Instances

Our company's DBA Manager has asked if it would be possible to externalize the HTTP server portion of APEX from the DB Servers. In other words, he would strongly prefer that the DB Servers *only* run Oracle Database software.
We know that we can install the HTTP server on another box but, in thinking about how to do this, we were wondering if it is really necessary to create a separate HTTP server installation for each APEX instance. What we'd really like to do is have one HTTP server for all our our Dev boxes and several (but, not one to one) for each of our upper environments; staging, qa, prod, etc.
Right now, each instance have a single dads.conf file on each DB box. So, if we we're to attempt to consolidate them, we'd need some way to embed multiple dads files and to associate each instance with the correct one.
Has anyone ever done this or (preferably) have some examples?
Thanks,
-Joe

Joe,
I don´t know a specific reference for it, I remembered it because when I was looking the documentation on the site, I saw the reference "Support for multiple database connections" in the URL: APEX Listener New Features 2.0</title><meta name="Title" content="APEX Listener New Features 2.0…
I´ve tried to use APEX listener some time ago, but in a earlier version together with glassfish. So, since for me was only one database, I created the necessary amount of DAD´s on my database, each one for a specific port.
Check the link and you´ll see the same information I saw.
Thanks.
José Valdézio
"Neo, everything that Oracle told me, became true, except extinguish bugs in a first release."

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