code: def launch_notebook(request, username, notebook_context):
      
      # The notebook manage now tries too hard to get the port allocated for the notebook user, making it slow
      # TODO: Manage a proper state e.g. using Redis
      notebook_info = launch_on_demand(request, username, notebook_context)
  
      # Jump to the detault notebook
      proxy_route = request.route_url("notebook_proxy", remainder="notebooks/{}".format(notebook_info["notebook_name"]))
      proxy_route = route_to_alt_domain(request, proxy_route)
  
      return HTTPFound(proxy_route)
docs: Renders a IPython Notebook frame wrapper.
  
      Starts or reattachs ot an existing Notebook session.