* Requests passed to the handler methods will be REST framework's `Request` instances, not Django's `HttpRequest` instances.
* Handler methods may return REST framework's `Response`, instead of Django's `HttpResponse`. The view will manage content negotiation and setting the correct renderer on the response.
* Any `APIException` exceptions will be caught and mediated into appropriate responses.
* Incoming requests will be authenticated and appropriate permission and/or throttle checks will be run before dispatching the request to the handler method.
Using the `APIView` class is pretty much the same as using a regular `View` class, as usual, the incoming request is dispatched to an appropriate handler method such as `.get()` or `.post()`. Additionally, a number of attributes may be set on the class that control various aspects of the API policy.
**Note**: The full methods, attributes on, and relations between Django REST Framework's `APIView`, `GenericAPIView`, various `Mixins`, and `Viewsets` can be initially complex. In addition to the documentation here, the [Classy Django REST Framework][classy-drf] resource provides a browsable reference, with full methods and attributes, for each of Django REST Framework's class-based views.
The following methods are used by REST framework to instantiate the various pluggable API policies. You won't typically need to override these methods.
These perform any actions that need to occur before or after calling the handler methods such as `.get()`, `.post()`, `put()`, `patch()` and `.delete()`.
Performs any actions that need to occur before the handler method gets called.
This method is used to enforce permissions and throttling, and perform content negotiation.
You won't typically need to override this method.
### .handle_exception(self, exc)
Any exception thrown by the handler method will be passed to this method, which either returns a `Response` instance, or re-raises the exception.
The default implementation handles any subclass of `rest_framework.exceptions.APIException`, as well as Django's `Http404` and `PermissionDenied` exceptions, and returns an appropriate error response.
If you need to customize the error responses your API returns you should subclass this method.
Ensures that any `Response` object returned from the handler method will be rendered into the correct content type, as determined by the content negotiation.
REST framework also allows you to work with regular function based views. It provides a set of simple decorators that wrap your function based views to ensure they receive an instance of `Request` (rather than the usual Django `HttpRequest`) and allows them to return a `Response` (instead of a Django `HttpResponse`), and allow you to configure how the request is processed.
The core of this functionality is the `api_view` decorator, which takes a list of HTTP methods that your view should respond to. For example, this is how you would write a very simple view that just manually returns some data:
By default only `GET` methods will be accepted. Other methods will respond with "405 Method Not Allowed". To alter this behaviour, specify which methods the view allows, like so:
To override the default settings, REST framework provides a set of additional decorators which can be added to your views. These must come *after* (below) the `@api_view` decorator. For example, to create a view that uses a [throttle][throttling] to ensure it can only be called once per day by a particular user, use the `@throttle_classes` decorator, passing a list of throttle classes:
