CORS Anywhere XMLHttpRequest example

file.js

// XMLHttpRequest.open override
var cors_api_host = 'cors-anywhere.herokuapp.com';
var cors_api_url = 'https://' + cors_api_host + '/';
var slice = [].slice;
var origin = window.location.protocol + '//' + window.location.host;
var open = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function() {
    var args = slice.call(arguments);
    var targetOrigin = /^https?:\/\/([^\/]+)/i.exec(args[1]);
    if (targetOrigin && targetOrigin[0].toLowerCase() !== origin &&
        targetOrigin[1] !== cors_api_host) {
        args[1] = cors_api_url + args[1];
    }
    return open.apply(this, args);
};

// use of the overriden method
var req = new XMLHttpRequest();
req.open('GET', 'https://genius.com/Quebonafide-bubbletea-lyrics', false); 
req.send(null);
console.log(req.response)