code: func (h *Host) serveImporterAccount(w http.ResponseWriter, r *http.Request, imp *importer, acctRef blob.Ref) {
  	ia, err := imp.account(acctRef)
  	if err != nil {
  		http.Error(w, "Unknown or invalid importer account "+acctRef.String()+": "+err.Error(), 400)
  		return
  	}
  	ia.ServeHTTP(w, r)
  }
docs: // Serves details of accounts at http://host/importer/twitter/sha1-23098429382934