Django - 代码不会进入＆＃39; process_request＆＃39;在自定义中间件中

Question

我使用this示例创建自定义中间件，但我稍微改了一下。调试时，我看到代码进入该类，并进入函数定义，但它没有进入函数内部。我使用的是django 1.10。

这是我的中间件类

class GlobalThreadVarMiddleware(object):
_threadmap = {}

@classmethod
def get_current_data_manager(cls):
    return cls._threadmap[_thread.get_ident()]['data_manager']

def process_request(self, request):
    self._threadmap[_thread.get_ident()] = {}
    self._threadmap[_thread.get_ident()]['data_manager'] = DataManager()

def process_exception(self, request, exception):
    try:
        del self._threadmap[_thread.get_ident()]
    except KeyError:
        pass

def process_response(self, request, response):
    try:
        del self._threadmap[_thread.get_ident()]['data_manager']
    except KeyError:
        pass
    return response

添加到MIDDLEWARE：

MIDDLEWARE = [

'workflows.api.global_thread_variables_middleware.GlobalThreadVarMiddleware'
 ....
]