FTP website didn't support all ISP network. This Script help to find the website support on network or not sending a fetch request.

Check Website Support on Network

async function check(url){
        let cors = "https://cors-anywhere.herokuapp.com/";      //This API enables cross-origin requests to anywhere.

        let checkUrl= cors+url;     //Merge cors and checking website url to avoid the cross-origin requests error             
        let response = await fetch(checkUrl);     //JavaScript can send network requests to the server

        if (response.ok) {    
            alert("Website Support On Your Network");   // if HTTP-status is 200-299       
        } else {
            alert("Website Not Support On Your Network");
        }

   }

 check("https://www.youtube.com/");