defer http response close higher up in va
defer http response close higher up in va

Updates #1266 because it's a better fix.

ZCloud-Firstserver/boulder,mehmooda/boulder,jcjones/boulder,ibukanov/boulder,bmw/boulder,jfrazelle/boulder,letsencrypt/boulder,jsha/boulder,sophie-h/boulder,jcjones/boulder,ZCloud-Firstserver/boulder,patf/boulder,sophie-h/boulder,r0ro/boulder,sophie-h/boulder,lucasallan/boulder,mehmooda/boulder,jsha/boulder,hlandauf/boulder,hlandauf/boulder,patf/boulder,hlandauf/boulder,benileo/boulder,mehmooda/boulder,patf/boulder,letsencrypt/boulder,r0ro/boulder,benileo/boulder,lucasallan/boulder,patf/boulder,jcjones/boulder,bmw/boulder,lucasallan/boulder,r0ro/boulder,r0ro/boulder,mehmooda/boulder,jfrazelle/boulder,ZCloud-Firstserver/boulder,jsha/boulder,jcjones/boulder,ibukanov/boulder,ZCloud-Firstserver/boulder,hlandauf/boulder,letsencrypt/boulder,bmw/boulder,benileo/boulder,benileo/boulder,jfrazelle/boulder,jfrazelle/boulder,ibukanov/boulder