Using KML in google maps

Well, I wanted to...

KML : https://developers.google.com/kml/documentation/?hl=fr

So I have a servlet, holding a list of POIs. And I return the KML as required...

To load google maps with a direct KML file or source:

https://maps.google.fr/maps?q=http://monserver.net/monservlet?action=get&name=mypoi

Normally this should work.... but although the map loads, it doesn't seem to want to show the pushpin with the POI...

What did I learn? that it looks nice and simple, but when it doesn't work its pretty hard to find out why....