在Gupshup IDE上发出http Post请求有效吗?

我复制了gupshup的文档代码，并仅将URL修改为" http://posttestserver.com/post.php "，它不起作用.

I copied gupshup's document code and modified just url as "http://posttestserver.com/post.php" and it doesn't work.

有人对我有建议吗?

else if(event.message.toLowerCase() == "post") {
    var contextParam = {
        "User": {
        "userName": "sbCobxxxx",
        "Password": "xxxxxxx-9f-4307-9d9a-451f3xxxx075",
        "Pin": "16776"
    }
    };
    var url = "http://posttestserver.com/post.php";
    var param = JSON.stringify(contextParam);
    var header = {"Content-Type": "application/json"};
    context.simplehttp.makePost(url, param, header);
}

function HttpResponseHandler(context, event) {
    // if(event.geturl === "http://ip-api.com/json")
    context.sendResponse(event.getresp);
}

响应返回空字符串:"

Response returns empty string: ""

提前谢谢.