code: def get_error_page(self, loadbalancer):
          
          uri = "/loadbalancers/%s/errorpage" % utils.get_id(loadbalancer)
          resp, body = self.api.method_get(uri)
          return body
docs: Load Balancers all have a default error page that is shown to
          an end user who is attempting to access a load balancer node
          that is offline/unavailable.