MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etag);
MHD_queue_response(hreq->connection, status, response);
MHD_destroy_response(response);
MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etag);
MHD_queue_response(hreq->connection, status, response);
MHD_destroy_response(response);