Do not throw exception for 1XX and 2XX status code

First of all, thanks for the module, so that I do not have to rely on zend-framework to do http request. However, I found this snippet in HttpClient.inc that is quite interesting.

    if ($response->responseCode == 200) {
      if ($this->formatter) {
        try {
          $result = $this->formatter->unserialize($response->body);
        }
        catch (Exception $e) {
          throw new HttpClientException('Failed to unserialize response', 0, $response, $e);
        }
      }
      else {
        $result = $response->body;
      }
    }
    // Output any errors set by remote drupal sites.
    elseif (!empty($response->drupalErrors)) {
      throw new HttpClientException(check_plain(implode("\n", $response->drupalErrors)), $response->responseCode, $response);
    }
    // Treat all remaining non-200 responses as errors
    else {
      throw new HttpClientException(check_plain($response->responseMessage), $response->responseCode, $response);
    }

I have a webservice that returns a number of 2xx status for different transactions (not always '200 OK'), if I use this class, I will keep getting exception whenever my script receives other 2xx status. I am just curious whether there is a reason behind the code above (throwing exception for all non-200 status) and is it OK to allow all 2xx (and probably all 1xx) statuses?