MooTools ...I like this Trojan Builder for the Messiah code

https://mootools.net/

MooTools uses a Class called Request.

// create a new Class instance
var myRequest = new Request({
    url: 'getMyText.php',
    method: 'get',
    onRequest: function(){
        myElement.set('text', 'loading...');
    },
    onSuccess: function(responseText){
        myElement.set('text', responseText);
    },
    onFailure: function(){
        myElement.set('text', 'Sorry, your request failed :(');
    }
});

// and to send it:
myRequest.send(data);