http_VSLH(const struct http *hp, unsigned hdr)
{
	int i;

	if (hp->vsl != NULL) {
		AN(hp->vsl->wid & (VSL_CLIENTMARKER|VSL_BACKENDMARKER));
		i = hdr;
		if (i > HTTP_HDR_FIRST)
			i = HTTP_HDR_FIRST;
		i += hp->logtag;
		VSLbt(hp->vsl, (enum VSL_tag_e)i, hp->hd[hdr]);
	}
}