middleware.py 文件源码

def process(self, app):
        for middleware_string in self.middleware:
            middleware = import_string(middleware_string)
            response = middleware()
            if hasattr(response, 'preprocess_request'):
                before_request = response.preprocess_request
                app.before_request(before_request)
            if hasattr(response, 'process_response'):
                after_request = response.process_response
                app.after_request(after_request)