django - django rest framework apiview 中的 format=none 引用是什么？

Question

文档在这里:http://www.django-rest-framework.org/api-guide/views/#get_permissionsself

在此示例中，格式设置为无，但未对其进行引用:

class ListUsers(APIView):
    """
    View to list all users in the system.

    * Requires token authentication.
    * Only admin users are able to access this view.
    """
    authentication_classes = (authentication.TokenAuthentication,)
    permission_classes = (permissions.IsAdminUser,)

    def get(self, request, format=None):
        """
        Return a list of all users.
        """
        usernames = [user.username for user in User.objects.all()]
        return Response(usernames)

我检查了源代码，仍然没有引用格式。

欣赏一些清晰度

Answer 1

您在 URL 中使用它们来附加后缀内容类型格式(HTML、JSON 或 API)。你可以在这里阅读:

http://www.django-rest-framework.org/tutorial/2-requests-and-responses/#adding-optional-format-suffixes-to-our-urls