修正方法

用一个简单的 WSGI Middleware 修改请求对象:

class SSLMiddleware(object):
    """
    Middleware that applies some fixes for people using
    Nginx manage HTTPS and forward requests as HTTP to
    backend server.
    """
    def process_request(self, request):
        # use HTTPS forever
        request.is_secure = lambda: True == True

将以上代码保存成 .py 文件, 并追加到 Django settings.py 文件 MIDDLEWARE_CLASSES 元组中, 重启后台服务器生效.