code: def login_handler(self, config=None, prefix=None, **args):
          
          headers = {}
          headers['Access-control-allow-origin'] = '*'
          headers['Content-type'] = 'text/html'
          auth = request.authorization
          if (auth and auth.username == auth.password):
              return self.set_cookie_close_window_response(
                  "valid-http-basic-login")
          else:
              headers['WWW-Authenticate'] = (
                  'Basic realm="HTTP-Basic-Auth at %s (u=p to login)"' %
                  (self.name))
              return make_response("", 401, headers)
docs: HTTP Basic login handler.
  
          Respond with 401 and WWW-Authenticate header if there are no
          credentials or bad credentials. If there are credentials then
          simply check for username equal to password for validity.