title: Display IFrame IPython with custom auth headers
body: <p>I am developing a JupyterLab Notebook and I need to embed a website for interaction with a dashboard from within the same notebook. This would be quite straight-forward using an IFrame.</p>
  <p>However, to access this website, that I launch on my public server, JWT authentication is required so I need to send an additional header with the token. Which is the best way to do this? I am not familiar with HTML and JS so I am wondering where to start from.</p>
  <p>Thanks a lot for your help!</p>