$.getJSON always returns null

I'm trying to make this work but I don't understand why this always returns "Request Failed"? The json seems to be valid (I know jQuery is strict about this), maybe it's because of the httpS?

var geo_url = "https://spapi.cdnspstr.com/api/get_geo_ip";

var jqxhr = $.getJSON(geo_url, {
    format: "json"
})
.done(function (json_data) {
    alert("currency: " + json_data.data.currency);
})
.fail(function () {
    alert("Request Failed");
});

---

var geo_url = "https://spapi.cdnspstr.com/api/get_geo_ip";

$.ajax({
    url: geo_url,
    data: {
        format: "json"
    },
    crossDomain: true,
    dataType: 'jsonp',
    success: function (json_data) {
        alert("currency: " + json_data.data.currency);
        alert("city: " + json_data.data.city);
    },
    error: function () {
        alert("Request Failed");
    }
});

小提琴

---

请求应该使用jsonp来完成，因为跨域json-ajax请求是不允许的

$.ajax("https://spapi.cdnspstr.com/api/get_geo_ip",{
    dataType: 'jsonp',
    success: function(json_data) {
        alert("currency: " + json_data.data.currency);
    },
    error: function() {
        alert("Request Failed");
    }
});

---

When in doubt, debug:

var geo_url = "https://spapi.cdnspstr.com/api/get_geo_ip";

var jqxhr = $.getJSON(geo_url, {
    format: "json"
})
.done(function (json_data) {
    alert("currency: " + json_data.data.currency);
})
.fail(function (jqXHR, textStatus, errorThrown) {
    console.log(jqXHR);
    console.log(textStatus);
    console.log(errorThrown);
    alert("Request Failed");
});

If there is any error in the backend (500, 403, ...), you will get Request Failed anyway.

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