Fetches the committed status of batches by either a POST or GET.

        Request:
            body: A JSON array of one or more id strings (if POST)
            query:
                - id: A comma separated list of up to 15 ids (if GET)
                - wait: Request should not return until all batches committed

        Response:
            data: A JSON object, with batch ids as keys, and statuses as values
            link: The /batch_statuses link queried (if GET)

async def list_statuses(self, request):
        """Fetches the committed status of batches by either a POST or GET.

        Request:
            body: A JSON array of one or more id strings (if POST)
            query:
                - id: A comma separated list of up to 15 ids (if GET)
                - wait: Request should not return until all batches committed

        Response:
            data: A JSON object, with batch ids as keys, and statuses as values
            link: The /batch_statuses link queried (if GET)
        """
        error_traps = [error_handlers.StatusResponseMissing]

        # Parse batch ids from POST body, or query paramaters
        if request.method == 'POST':
            if request.headers['Content-Type'] != 'application/json':
                LOGGER.debug(
                    'Request headers had wrong Content-Type: %s',
                    request.headers['Content-Type'])
                raise errors.StatusWrongContentType()

            ids = await request.json()

            if (not ids
                    or not isinstance(ids, list)
                    or not all(isinstance(i, str) for i in ids)):
                LOGGER.debug('Request body was invalid: %s', ids)
                raise errors.StatusBodyInvalid()
            for i in ids:
                self._validate_id(i)

        else:
            ids = self._get_filter_ids(request)
            if not ids:
                LOGGER.debug('Request for statuses missing id query')
                raise errors.StatusIdQueryInvalid()

        # Query validator
        validator_query = \
            client_batch_submit_pb2.ClientBatchStatusRequest(
                batch_ids=ids)
        self._set_wait(request, validator_query)

        response = await self._query_validator(
            Message.CLIENT_BATCH_STATUS_REQUEST,
            client_batch_submit_pb2.ClientBatchStatusResponse,
            validator_query,
            error_traps)

        # Send response
        if request.method != 'POST':
            metadata = self._get_metadata(request, response)
        else:
            metadata = None

        data = self._drop_id_prefixes(
            self._drop_empty_props(response['batch_statuses']))

        return self._wrap_response(request, data=data, metadata=metadata)