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

	if (hp->vsl != NULL) {
		/* We don't support unsetting stuff in the first line */
		assert (hdr >= HTTP_HDR_FIRST);
		AN(hp->vsl->wid & (VSL_CLIENTMARKER|VSL_BACKENDMARKER));
		i = (HTTP_HDR_UNSET - HTTP_HDR_METHOD);
		i += hp->logtag;
		VSLbt(hp->vsl, (enum VSL_tag_e)i, hp->hd[hdr]);
	}
}