DRF request 与 Responses 的封装！

Responses  默认是调用的是 render 实现达到渲染的目的！
前端请求 字段 Accept 指定希望得到的数据类型！或者在 url 后缀之中指定结尾类型，也就是希望返回的类型！

#在setting 指定返回类型
REST_FRAMEWORK = {
    'DEFAULT_RENDERER_CLASSES': (
        'rest_framework.renderers.JSONRenderer',
        'rest_framework.renderers.BrowsableAPIRenderer',
    )
}

在单独的视图指定渲染

from django.contrib.auth.models import User
from rest_framework.renderers import JSONRenderer
from rest_framework.response import Response
from rest_framework.views import APIView

class UserCountView(APIView):
    """
    A view that returns the count of active users in JSON.
    """
    renderer_classes = (JSONRenderer, )

    def get(self, request, format=None):
        user_count = User.objects.filter(active=True).count()
        content = {'user_count': user_count}
        return Response(content)

request默认的JSON或表单数据来进行解析,前端请求包含字段Content-Type 设置响应方式，以便后端解析数据！

REST_FRAMEWORK = {
#此设置说明只能按照 json 进行数据解析！
    'DEFAULT_PARSER_CLASSES': (
        'rest_framework.parsers.JSONParser',
    )
}

也可以为单个请求类进行指定解析器！(参考文档！)

from rest_framework.parsers import JSONParser
from rest_framework.response import Response
from rest_framework.views import APIView

class ExampleView(APIView):
    """
    A view that can accept POST requests with JSON content.
    """
    parser_classes = (JSONParser,)

    def post(self, request, format=None):
        return Response({'received data': request.data})