PHP - JS - WebSocket connection to 'ws: // localhost: 8125 /' failed: Error in connection establishment: net :: ERR_CONNECTION_REFUSED

I have a problem trying to login to my local webpage. When I click on the enter button or when loading the page, it appears on the console:

Making validation of the query I also notice that the variables that are passed by post do not take them and the query is empty with the user and password variables.

Php code:

 public function Login(){
    try{

        if(!empty($_POST['user']) and !empty($_POST['pass']) and !empty($_POST['session'])){
            $db = new Conexion();
            $this->user = $db->real_escape_string($_POST['user']);
            $this->pass = $this->Encrypt($_POST['pass']);


            $sql = $db->query("SELECT * FROM login WHERE usuario='$this->user' AND pass='$this->pass';");

            $path0 = $_SERVER['DOCUMENT_ROOT'];
            $path0 .= "mm/sqlLogin.txt";
            fopen($path0, "r");
            $myfile = fopen($path0, "w") or die("Unable to open file!");
            fwrite($myfile, $sql);
            fclose($myfile);

                if($db->rows($sql) > 0){
                    if($_POST['session'] == true) {
                        $datos = $db->recorrer($sql);
                        $_SESSION['id'] = $datos=['idlogin'];
                        $_SESSION['user'] = $datos=['usuario'];
                        $_SESSION['email'] = $datos=['email'];
                        init_set('session.cookie_lifetime', time() + (60*60*24*1));
                        echo 1;
                    }

                }else{

                    throw new Exception(2);
                }
                $db->liberar($sql);
                $db->close();

        }else{
            $sql ='Error en query al intentar login en = ' . ("SELECT * FROM login WHERE usuario='$this->user' AND pass='$this->pass';") . ' Datos vacíos';

            $path0 = $_SERVER['DOCUMENT_ROOT'];
            $path0 .= "mm/loginlog.txt";
            $myfile = fopen($path0, "w") or die("Unable to open file!");
            fwrite($myfile, $sql);
            fclose($myfile);
            //throw new Exception('Error datos vacíos.');
        }
    }catch(Exception $e){
        echo $e->getMessage();
    }
}

JS Code:

window.onload = function(){
document.getElementById("send_request").onclick = function(){
    var connect, user, pass, session, form, result;
    user = document.getElementById("user").value;
    pass = document.getElementById("pass").value;
    session = document.getElementById("session").checked ? true : false;

    if(user != '' && pass !=''){
    form = 'user=' + user + '&pass=' + pass + '&session=' + session;

    connect = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
    connect.onreadystatechange = function(){
        if(connect.readyState == 4 && connect.status == 200){
            if(parseInt(connect.responseText) == 1){
                result = '<div class="w3-panel w3-display-container w3-green">';
                result += '<span onclick="this.parentElement.style.display=';
                result += "'none'";
                result += '" ';
                result += 'class="w3-btn w3-display-topright">X</span>';
                result += '<p>Acceso</p>';
                result += '<p>Conectando...</p>';    
                result += '</div>';
                location.href='?view=index';
                document.getElementById("message").innerHTML = result;
             }else{
                result = '<div class="w3-panel w3-display-container w3-red">';
                result += '<span onclick="this.parentElement.style.display=';
                result += "'none'";
                result += '" ';
                result += 'class="w3-btn w3-display-topright">X</span>';
                result += '<p>Error</p>';
                result += '<p>Credenciales incorrectas.</p>';    
                result += '</div>';
                document.getElementById("message").innerHTML = result;

            }   

        }else if(connect.readyState != 4){
                result = '<div class="w3-panel w3-display-container w3-yellow">';
                result += '<span onclick="this.parentElement.style.display=';
                result += "'none'";
                result += '" ';
                result += 'class="w3-btn w3-display-topright">X</span>';
                result += '<p>Conectando</p>';
                result += '<p>Procesando...</p>';    
                result += '</div>';
                document.getElementById("message").innerHTML = result;


        }
    }

    connect.open('POST','?view=login',true);
    connect.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    connect.send(form);
    //window.alert("Bienvenido");
    }else{
        result = '<div class="w3-panel w3-display-container w3-yellow">';
        result += '<span onclick="this.parentElement.style.display=';
        result += "'none'";
        result += '" ';
        result += 'class="w3-btn w3-display-topright">X</span>';
        result += '<p>Error</p>';
        result += '<p>Usuario y contraseña no pueden estar vacíos.</p>';    
        result += '</div>';
        document.getElementById("message").innerHTML = result;

    }

}

}

Your help please.