code: def get(self):
      
      client_customer_id = self.request.get('clientCustomerId')
  
      template_values = {
          'back_url': '/showAccounts',
          'back_msg': 'View Accounts.',
          'ccid': client_customer_id,
          'logout_url': users.create_logout_url('/'),
          'user_nickname': users.get_current_user().nickname()
      }
  
      try:
        try:
          app_user = InitUser()
  
          # Load Client instance.
          handler = APIHandler(app_user.client_id,
                               app_user.client_secret,
                               app_user.refresh_token,
                               app_user.adwords_manager_cid,
                               app_user.developer_token)
  
          campaigns = handler.GetCampaigns(client_customer_id)
        except Exception, e:
          template_values['error'] = str(e)
      finally:
        # Use template to write output to the page.
        template_values['campaigns'] = campaigns
        path = os.path.join(os.path.dirname(__file__),
                            '../templates/show_campaigns.html')
        self.response.out.write(template.render(path, template_values))
docs: Handle get request.