Beginner help Cross-Origin Request Blocked

JavaScript
1

I’m trying to use “worldtimeapi”, but keep getting the following error:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

The same JavaScript works fine when I call “worldclockapi”;

Here is my JavaScript:

…
function pollServer() {
var xmlhttp = new XMLHttpRequest();
var url = “http://worldtimeapi.org/api/ip”;

xmlhttp.onreadystatechange = function () {
    if (this.readyState == 4 && this.status == 200) {
        document.getElementById("utc").innerHTML = "success";
        var myArr = JSON.parse(this.responseText);
        myFunction(myArr);
    }
};
xmlhttp.open("GET", url, true);
xmlhttp.send();

setTimeout(pollServer, 1000);

}
…

Does anyone know how I can get this request working? Any help would be much appreciated

2 
function pollServer() {
    var xmlhttp = new XMLHttpRequest();
    var url = "https://worldtimeapi.org/api/ip"; // <-- make it a secure call

    xmlhttp.onreadystatechange = function () {
        if (this.readyState == 4 && this.status == 200) {
            console.log('success:', this.responseText)
//             document.getElementById("utc").innerHTML = "success";
            var myArr = JSON.parse(this.responseText);
            console.log(myArr)
//             myFunction(myArr);
        }
    };
    xmlhttp.open("GET", url, true);
    xmlhttp.send();

    setTimeout(pollServer, 1000);

}

pollServer()

According to the API docs, you don’t need to make the call to an https:// address, however, browsers are frequently requiring it. (Firefox did when I tried to run run it with just http://.)

And for what it’s worth, you should also check out https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API (Unless there’s an absolute need to use xmlhttp, I wouldn’t. These days I use fetch or the axios library.)

3

Thanks for the advice.

My code is working now after I contacted the site owner and they enabled CORS on the server.

1 Like