docs: def convert_response(allocate_quota_response, project_id):
      """Computes a http status code and message `AllocateQuotaResponse`
  
      The return value a tuple (code, message) where
  
      code: is the http status code
      message: is the message to return
  
      Args:
         allocate_quota_response (:class:`endpoints_management.gen.servicecontrol_v1_messages.AllocateQuotaResponse`):
           the response from calling an api
  
      Returns:
         tuple(code, message)
      """
      if not allocate_quota_response or not allocate_quota_response.allocateErrors:
          return _IS_OK
  
      # only allocate_quota the first error for now, as per ESP
      theError = allocate_quota_response.allocateErrors[0]
      error_tuple = _QUOTA_ERROR_CONVERSION.get(theError.code, _IS_UNKNOWN)
      if error_tuple[1].find(u'{') == -1:  # no replacements needed:
          return error_tuple
  
      updated_msg = error_tuple[1].format(project_id=project_id, detail=theError.description or u'')
      return error_tuple[0], updated_msg