00，跨域的问题

    def __init__(self, get_response=None):

        self.get_response = get_response

        super().__init__()

    def __call__(self, request):

        response = None

        if hasattr(self, ‘process_request‘):

            response = self.process_request(request)

        if not response:

            response = self.get_response(request)

        if hasattr(self, ‘process_response‘):

            response = self.process_response(request, response)

        return response

class CORSMiddleware(MiddlewareMixin):

    def process_response(self, request, response):

        # 添加响应头

        # 允许你的域名来获取我的数据

        response[‘Access-Control-Allow-Origin‘] = "*"

        # 允许携带Content-Type请求头

        # response[‘Access-Control-Allow-Headers‘] = ‘Content-Type‘    Content-Type = url-encodeing

        # 允许发送DELETE，PUT(复杂请求)

        # response[‘Access-Control-Allow-Methods‘] = "DELETE, PUT"

        return response

    ...

    ‘app01.cors.CORSMiddleware‘,

]