Reading external API response

[JulissaDantes]

All this code is on init, why is isDefined(an) == true, shouldn't it have the response json?:

const var p = {
    "request": "some text"
};

reg an;
Server.setBaseURL(url);
Server.callWithGET("/", p, function(status, response)
{
     an = response;
     Console.print(trace(response));//This shows the json object on the console with no problems
});
if(isDefined(an)){
Console.print("Something is wrong");
}

How can I use the response? is "undefined"

[Christoph Hart]

This call is asynchronous - the function will be executed when you get a server response. The onInit callback will be long over by then.