当请求为ssl时，Heroku将HTTP_X_FORWARDED_PROTO设置为https，我们可以使用它来检查：
from django.conf import settings
from django.http import HttpResponseRedirect
class SSLMiddleware(object):
def process_request(self, request):
if not any([settings.DEBUG, request.is_secure(), request.Meta.get("HTTP_X_FORWARDED_PROTO", "") == 'https']):
url = request.build_absolute_uri(request.get_full_path())
secure_url = url.replace("http://", "https://")
return HttpResponseRedirect(secure_url)
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