code: public List<String> listDomHosting() throws IOException {
  		ArrayList<String> doms = new ArrayList<String>();
  		HashSet<String> d = new HashSet<String>(this.domain.GET(null));
  		for (String s : this.hostingweb.GET())
  			if (d.contains(s))
  				doms.add(s);
  		return doms;
  	}
docs: helper
  @return
  @throws IOException