Can a website connect to the backend?

Hi,

You can do it with puzzles and some code. Attached an example project for ya.

function prepareExternalInterface(app) {
    // register functions in the app.ExternalInterface to call them from Puzzles, e.g:
    app.ExternalInterface.doRequest = function(url) {
        var xhttp = new XMLHttpRequest();
        xhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                app.ExternalInterface.myJSCallback(xhttp.responseText);
            }
        };
        xhttp.open("GET", url, true);
        xhttp.send();
    }
}