let username = document.getElementById("login_username").value;
    let password = document.getElementById("login_password").value;
    let csrftoken = document.getElementById("login_csrftoken").value;

    xhttp.open("POST", "/app/api/login/" + username + "/" + password, true);
    xhttp.setRequestHeader("X-CSRFToken", csrftoken);
    xhttp.send();