AJAX Basics

    //AJAX THEORY
    Asynchronous Javascript & XML
    Set of web Technologies
    Send & receive data from a client to a server asynchronously, without reload
    Does not interfere with current web page
    XML has been replaced by JSON mostly

    //IMAGE
    Allows to make requests in the backgroun without reload or refresh our webpage.
    Different ways to do it. We will be using Javascript
    We make a HmlHttpRequest (XHR) Object:
    API in the form of object, provided by browser's JS, methods, can be used with other protocols other than HTTP (but it is the most common).
    Server returns data in JSON, XML, text.
    

    // Libraries / Methods
    jQuery, Axios, Superagent, Fetch API, Prototype, Node HTTP

    //SETUP
    Need to be running a Server -> XAMPP
    Folder in htdocs (coding/others/ajax)

    //Basic
    XMLHttpRequest();
    xhr.open('GET', 'sample.txt', true); // xhr.open('GET', 'https://api.github.com/users', true);
    xhr.onload = function(){...}
    xhr.send();
    JSON.parse(this.responseText);