KQL "externaldata" operator fail

[gfeng]

KQL code as follow:

let ipdetail=(ip:string) {

    let myurl=strcat('"https://ipapi.co/', ip, '/json"');

    let mydetail=externaldata(detail:string )[h@myurl]with(format="raw");

    mydetail

};

print ipdetail("18.140.16.195")

It fails with:

“Failed to parse the query, no additional information is available. If the issue persists, please open a support ticket. Request id: 7c040878-08b5-4ccc-9154-9f5ece20d362”

Anyone know the reason?

[#2]

@gfeng 

I'm not sure that will do what you need.  You can build the string this way

let ipdetail= (ip:string) { strcat('externaldata(detail:string )[h@"', strcat("https://ipapi.co/",ip,'/json'),'"]with(format="raw")') };
print ipdetail("18.140.16.195")

However the result is the string you built not the result of the execution of the externaldata operator