cors中间件

class MiddlewareMixin(object):
    def __init__(self, get_response=None):
        self.get_response = get_response
        super(MiddlewareMixin, self).__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'] = "*"

        # 允许你携带Content-Type请求头
        response['Access-Control-Allow-Headers'] = "Content-Type"

        # 允许你发送DELETE,PUT
        response['Access-Control-Allow-Methods'] = "DELETE,PUT"

        return response

在settings.py文件中添加中间件

前后端分离开发

 或导入

from django.utils.deprecation import MiddlewareMixin

查找MiddlewareMixin方法：1 .在setting.py文件中，随便找一个中间件

　　　　　　　　　　　　  2.查看父类

　　　　　　　　　　　　  3.查看父类所在.py文件的导入模块

优化

class MiddlewareMixin(object):
    def __init__(self, get_response=None):
        self.get_response = get_response
        super(MiddlewareMixin, self).__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'] = "*"
        
        if request.method == "OPTIONS":
            # 允许你携带Content-Type请求头
            response['Access-Control-Allow-Headers'] = "Content-Type"
            # 允许你发送DELETE,PUT
            response['Access-Control-Allow-Methods'] = "DELETE,PUT"

        return response