django中得到当前域名

    # request.is_secure()
    #若是是https则为True，反之为False
    http = urlsplit(request.build_absolute_uri(None)).scheme
    #得到当前的HTTP或HTTPS
    host = request.META['HTTP_HOST']
    #获取当前域名
    shorturl = http + '://' + host + '/' + shorturl1 + '/'
    # shorturl = re.search(r'http[s]?://[^/]+', url).group()+'/'+shorturl1+'/'