I’m using this function to check if a webpage exists. To do this I

Question

0

Asked: May 27, 20262026-05-27T10:42:19+00:00 2026-05-27T10:42:19+00:00

I’m using this function to check if a webpage exists. To do this I

0

I’m using this function to check if a webpage exists. To do this I am checking if it has a header. But I always get a 404, even with a blank url.. what am I doing wrong here?

var xmlhttp;
function checkURL(url){
    xmlhttp=null; // initialize the request object
    // All the browsers except for the old IE
    if (window.XMLHttpRequest)
    {
        xmlhttp=new XMLHttpRequest()
        xmlhttp.onreadystatechange=xmlhttpChange
        xmlhttp.open("HEAD",url,true)
        xmlhttp.send(null)
    }
    // old IE
    else if (window.ActiveXObject)
    {
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
        if (xmlhttp)
        {
            xmlhttp.onreadystatechange=xmlhttpChange
            xmlhttp.open("HEAD",url,true)
            xmlhttp.send();
        }
    }
}

function xmlhttpChange()
{
    // if loaded
    if (xmlhttp.readyState==4)
    {
        // if head exists "OK"
       if (xmlhttp.status==200)
       {
           alert('URL exists')
       }
       else
       {
           alert("Status is "+xmlhttp.status)
       }
    }
}