Restricting IPs on Web Service calls

Hi all,

I'm exposing a web service in a public internet site. But I want this WS to be consumed only by a few IP addresses. How would you go about doing this? Can I do it on an Outsystems level? Do I need an intervention of the IT systems team?
I need ideas, please.

you can do it on outsystems-level.
check the htprequesthandler extension.

but imho you should implement those rules on a higher level. thus in IIS or firewalls even..