```
              [
```

                    课程介绍
                ](_index_)

```
              [
```

                    引入DjangoRESTframework
                ](c01-introducetodrf_index)
        - 
                [
                    Web应用模式
                ](c01-introducetodrf_separatedfrontendandbackend)

```
              [
```

                    认识RESTful
                ](c01-introducetodrf_introducetorest)

```
              [
```

                    RESTful设计方法
                ](c01-introducetodrf_howtodesignrest)

```
              [
```

                    使用Django开发REST接口
                ](c01-introducetodrf_developrestapiwithdjango)

```
              [
```

                    明确REST接口开发的核心任务
                ](c01-introducetodrf_coretasktodeveloprestapi)

```
              [
```

                    DjangoRESTframework简介
                ](c01-introducetodrf_aboutdrf)

```
              [
```

                    DRF工程搭建
                ](c02-drfproject_index)
        - 
                [
                    环境安装与配置
                ](c02-drfproject_installandconfig)

```
              [
```

                    见识DRF的魅力
                ](c02-drfproject_thefirstdrfprogram)

```
              [
```

                    Serializer序列化器
                ](c03-serializer_index)
        - 
                [
                    定义Serializer
                ](c03-serializer_declaring)

```
              [
```

                    序列化使用
                ](c03-serializer_serializing)

```
              [
```

                    反序列化使用
                ](c03-serializer_deserializing)

```
              [
```

                    模型类序列化器ModelSerializer
                ](c03-serializer_modelserializer)

```
              [
```

                    视图
                ](c04-view_index)
        - 
                [
                    Request与Response
                ](c04-view_requestandresponse)

```
              [
```

                    视图概览
                ](c04-view_view)

```
              [
```

                    视图说明
                ](c04-view_viewintroduction)

```
              [
```

                    视图集ViewSet
                ](c04-view_viewset)

```
              [
```

                    路由Router
                ](c04-view_routers)

```
              [
```

                    其他功能
                ](c05-components_index)
        - 
                [
                    认证
                ](c05-components_authentication)

```
              [
```

                    权限
                ](c05-components_permissions)

```
              [
```

                    限流
                ](c05-components_throttling)

```
              [
```

                    过滤
                ](c05-components_filtering)

```
              [
```

                    排序
                ](c05-components_ordering)

```
              [
```

                    分页
                ](c05-components_pagination)

```
              [
```

                    版本
                ](c05-components_versioning)

```
              [
```

                    异常处理
                ](c05-components_exceptions)

```
              [
```

                    自动生成接口文档
                ](c05-components_documents)

          [
              Published with GitBook
          ](https://www.gitbook.com)

课程介绍

限流Throttling

可以对接口访问的频次进行限制，以减轻服务器压力。

使用

可以在配置文件中，使用DEFAULT_THROTTLE_CLASSES 和 DEFAULT_THROTTLE_RATES进行全局配置，

REST_FRAMEWORK = {
    'DEFAULT_THROTTLE_CLASSES': (
        'rest_framework.throttling.AnonRateThrottle',
        'rest_framework.throttling.UserRateThrottle'
    ),
    'DEFAULT_THROTTLE_RATES': {
        'anon': '100/day',
        'user': '1000/day'
    }
}

DEFAULT_THROTTLE_RATES 可以使用 second, minute, hour 或day来指明周期。
也可以在具体视图中通过throttle_classess属性来配置，如

from rest_framework.throttling import UserRateThrottle
from rest_framework.views import APIView
class ExampleView(APIView):
    throttle_classes = (UserRateThrottle,)
    ...

可选限流类

1） AnonRateThrottle
限制所有匿名未认证用户，使用IP区分用户。
使用DEFAULT_THROTTLE_RATES['anon'] 来设置频次
2）UserRateThrottle
限制认证用户，使用User id 来区分。
使用DEFAULT_THROTTLE_RATES['user'] 来设置频次
3）ScopedRateThrottle
限制用户对于每个视图的访问频次，使用ip或user id。
例如：

class ContactListView(APIView):
    throttle_scope = 'contacts'
    ...
class ContactDetailView(APIView):
    throttle_scope = 'contacts'
    ...
class UploadView(APIView):
    throttle_scope = 'uploads'
    ...

REST_FRAMEWORK = {
    'DEFAULT_THROTTLE_CLASSES': (
        'rest_framework.throttling.ScopedRateThrottle',
    ),
    'DEFAULT_THROTTLE_RATES': {
        'contacts': '1000/day',
        'uploads': '20/day'
    }
}

实例

from rest_framework.authentication import SessionAuthentication
from rest_framework.permissions import IsAuthenticated
from rest_framework.generics import RetrieveAPIView
from rest_framework.throttling import UserRateThrottle
class BookDetailView(RetrieveAPIView):
    queryset = BookInfo.objects.all()
    serializer_class = BookInfoSerializer
    authentication_classes = [SessionAuthentication]
    permission_classes = [IsAuthenticated]
    throttle_classes = (UserRateThrottle,)