Realm Http Service IP Rule

Hi,

I’m trying to restrict access to a n HTTP Service Enpoint and don’t know how to build the correct
JSO expression. I see something in the docs with an example similar to:

{
    "%%args.url.host" : {
        "%in" :[ "www.mydomain.com","159.250.110.2"]
    }
}

This does not work.

I also don’t know what args are in the expression. Are they arguments to the function?
In which case, I’ve tried

{
    "%%args.payload.headers.Origin" : {
        "%in" :[ "www.mydomain.com","159.250.110.2", "http://159.250.110.2", "http://127.0.0.1:4503"]
    }
}

And get the following error:

“incoming webhook evaluation blocked by CanEvaluate”

Anyone know how to do this?