通过Chrome上的JavaScript书签获取远程IP

Question

I'm trying to make a small snippet on Google Chrome (as a bookmark) so I can "alert" my remote ip adress, but it is not working as it gives me the following error :

XMLHttpRequest cannot load https://l2.io/ip.js?var=myip . No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin ' http://stackoverflow.com ' is therefore not allowed access.

var url = "https://l2.io/ip.js?var=myip"
var httpRequest = new XMLHttpRequest()
httpRequest.onreadystatechange = function (data) {
  // code
}
httpRequest.open('GET', url)
httpRequest.send()
alert(httpRequest["response"])

How can I get around this problem ?

Answer 1

You can get around this problem in a few ways. Tampermonkey , Chrome extensions or a Chrome app.

Here is an example using Tampermonkey.

// ==UserScript==
// @name       Show my IP
// @version    0.1
// @include    /https?:\/\/*/
// @grant      GM_xmlhttpRequest
// @grant      GM_registerMenuCommand
// ==/UserScript==

GM_registerMenuCommand('My IP', run);

function run(){
    GM_xmlhttpRequest({
        method: "GET",
        url: "https://l2.io/ip.js?var=myip",
        onload: function(response) {
            alert(response.responseText);
        }
    });
}

This adds a menu option to the tampermonkey plugin called "My IP" that when you click it, it shows the alert box.