where do i put robots.txt?

Hi Netweaver guru's

Can someone tell me if it is possible to add a robot.txt file on an external facing netweaver java instance?

We are running an xLSO solution, which is available from the internet.

The solutions i created so that you can access it by goring to: learning.mycompany.com which will then redirect you to learning.mycompany.com/xlso/xxxxx

So, there are no reverse proxies or anything in between, and therefore wee need a robots.txt file (to keep search engines from cataloging the content).

I can see that it is possible, and sap has some recomendations, when you run an external facing portal for instance.

But i cant seem to find a guide or how-to

Help is therefore much apreciated!

Best regards

Ronni