I'am trying to get my front end to when the 1st proxy returns a 404 response it will try two use the second proxy link and then if that fails finally produce an out put of "error bad pathway" if both fail. Below is what i have at the moment.

function Wordcount()

{

let xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {   
    
        if (this.readyState == 4 && this.status == 200) {
        var j = JSON.parse(this.response);
        document.getElementById('output').value = j.answer;
        
        
    } 
    
    else {
        document.getElementById('output').value = "error bad pathway";
    }
          
};
let url = proxyURl + "/?text=" + encodeURI(document.getElementById('content').value) + "&route=" + "wordcount";
xhttp.open("GET",url);
        xhttp.send();

}