Ajax - The Infamous "Access-Control-Allow-Origin" Issue

I'm currently working with the Livestream API in an attempt to check if a specific channel is live, but I keep encountering this error message:

XMLHttpRequest cannot load http://channel.api.livestream.com/1.0/livestatus?channel=huskystarcraft. Origin http://www.webdevstl.com is not allowed by Access-Control-Allow-Origin.

Do I need to use PHP for this or am I missing something in my ajax call? The code seems quite simple:

function getActive(){
    if(window.XMLHttpRequest)
    {
        xmlhttp = new XMLHttpRequest();
    }
    else
    {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }

    xmlhttp.onreadystatechange = function()
    {
        if(xmlhttp.readyState == 4 && xmlhttp.status == 200)
        {   
            var json = JSON.parse(xmlhttp.responseText);
            console.log(json);
        }
    }

    xmlhttp.open("GET", "http://channel.api.livestream.com/1.0/livestatus?channel=huskystarcraft", true);
    xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    xmlhttp.send();
}
getActive();

Answer №1

The issue you're facing is due to the constraints set forth by the Same Origin Policy. Essentially, making AJAX calls to a different domain is not allowed and will result in failure - unless explicitly authorized by the external server.

To resolve this, consider using JSONP (often used for API data) or routing the request through your own server/domain.

Another approach could be CORS, but this requires access to modify the configuration of the remote server.

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