I am using FLASK + Ajax to make login page. It should redirects to another page in case of correct username and password.

I made a form. and the request is passing successfully. and I can catch the data in python ( flask ). but my issue that no redirect happens after rendering the page. with render_template

Here is to redirect to login page when requesting the root url

@app.route('/')
def OperationPage():
    log_screenprint('User Has Requested / URL >> Redirect to /login')
    return  redirect(url_for('page_login'))

And this is the function which verify the username and password. then it should redirect to the next page

@app.route('/login' , methods=["POST","GET"])
def page_login() :
    log_screenprint('Got Request From GUI User to login With Cred.')

    for key,value in securityFile.items() :
        dbUser = securityFile[key]['username']
        dbpass = securityFile[key]['defaultpass']

        username = request.form.get('username')
        password = request.form.get('password')
        sessionId = request.form.get('session')

        if dbUser == username :
            if dbpass == password :
                socketio.emit('userDb' , json.dumps(securityFile[key]) , session = sessionId)
                return render_template('/index.html' ,  title= 'Home Page')

    return render_template('/login.html')

and this is the request I am using in javascript.

  $('#login-form').submit(function (e) {
  e.preventDefault();
  var username = document.querySelector('.login-username').value
  var password = document.querySelector('.login-password').value
    $.ajax({
      url: '/login',
      data: {
              username: username,
              password: password,
              session : (socket.id),
          },
        type: 'POST',
        success: function (response) {
          console.log('response');
        },
        error: function (error) {
          console.log(error);
        }
      });
  });

The issue again that. even the correct username and password. the index.html is not rendering