Handle get request.

def get(self):
    """Handle get request."""
    template_values = {
        'back_url': '/',
        'back_msg': 'View Accounts',
        'logout_url': users.create_logout_url('/'),
        'user_nickname': users.get_current_user().nickname()
    }
    try:
      try:
        app_user = InitUser()

        template_values['email'] = app_user.email if app_user.email else ''
        template_values['client_id'] = (app_user.client_id if app_user.client_id
                                        else '')
        template_values['client_secret'] = (app_user.client_secret if
                                            app_user.client_secret else '')
        template_values['refresh_token'] = (app_user.refresh_token if
                                            app_user.refresh_token else '')
        template_values['adwords_manager_cid'] = (
            app_user.adwords_manager_cid if app_user.adwords_manager_cid else ''
        )
        template_values['dev_token'] = (app_user.developer_token if
                                        app_user.developer_token else '')
      except Exception, e:
        template_values['error'] = str(e)
    finally:
      # Use template to write output to the page.
      path = os.path.join(os.path.dirname(__file__),
                          '../templates/show_credentials.html')
      self.response.out.write(template.render(path, template_values))