Overrides the ingress function for response logging.

    Args:
      envelope: An Element with the SOAP request data.
      http_headers: A dict of the current http headers.
      operation: The SoapOperation instance.

    Returns:
      A tuple of the envelope and headers.

def ingress(self, envelope, http_headers, operation):
    """Overrides the ingress function for response logging.

    Args:
      envelope: An Element with the SOAP request data.
      http_headers: A dict of the current http headers.
      operation: The SoapOperation instance.

    Returns:
      A tuple of the envelope and headers.
    """
    if self._logger.isEnabledFor(logging.DEBUG):
      self._logger.debug(_RESPONSE_XML_LOG_LINE,
                         etree.tostring(envelope, pretty_print=True))

    if self._logger.isEnabledFor(logging.WARN):
      warn_data = {}
      header = envelope.find(_HEADER_XPATH)
      fault = envelope.find(_FAULT_XPATH)
      if fault is not None:
        warn_data['faultMessage'] = fault.find('faultstring').text

        if header is not None:
          header_data = {
              re.sub(_REMOVE_NS_REGEXP, '', child.tag): child.text
              for child in header[0]}
          warn_data.update(header_data)

        if 'serviceName' not in warn_data:
          warn_data['serviceName'] = operation.binding.wsdl.services.keys()[0]

        if 'methodName' not in warn_data:
          warn_data['methodName'] = operation.name

        self._logger.warn('Error summary: %s', warn_data)

    return envelope, http_headers