JSFiddle - React, Tailwind, and code Playground

JavaScript

var callback  =  function (x){ 
    
   
    
                        if(x)  
                                alert ("You can make real call to this url"); 
                                else
                                alert ("Somthing worng");
                            };
$.ajax({
        type: 'HEAD',
        url: "/echo/json",
        success: function() {
            callback(true);
           
        },
        error: function() {
             callback(false);
        }            
    });