docs: def call_func(self, req, *args, **kwargs):
          """Add json_error_formatter to any webob HTTPExceptions."""
          try:
              return super(SdkWsgify, self).call_func(req, *args, **kwargs)
          except webob.exc.HTTPException as exc:
              msg = ('encounter %(error)s error') % {'error': exc}
              LOG.debug(msg)
              exc.json_formatter = json_error_formatter
              code = exc.status_int
              explanation = six.text_type(exc)
  
              fault_data = {
                  'overallRC': 400,
                  'rc': 400,
                  'rs': code,
                  'modID': SDKWSGI_MODID,
                  'output': '',
                  'errmsg': explanation}
              exc.text = six.text_type(json.dumps(fault_data))
              raise exc