JSFiddle - React, Tailwind, and code Playground

JavaScript

$.ajax({
    url:'doesnotexist.php',
         data:'lots of data from 200KB to 5MB',
         type:'post',
         success: function(data)
                    {
                        alert('Success');
                      //some stuff on success

                    },
          error: function(XMLHttpRequest, textStatus, errorThrown)
                    {
                        alert(JSON.stringify(errorThrown));
                      //some stuff on failure
                    }
        });