您需要将GET端点url添加到urls.py以使用GET请求。GET url在你的urls.py中丢失，只需编辑你的urls.py如下：

# urls.py

from django.urls import include, path
from classroom.views.classroom import current_user, UserList
from .views import classroom, suppliers, teachers

urlpatterns = [
               path('', classroom.home, name='home'),
               path('current_user/', current_user),
               path('users/', UserList.as_view()),
               path('users/<int:pk>/', UserList.as_view()),
              ]

你需要在你的UserList视图中实现get方法，比如：

# views.py

class UserList(APIView):
    """
    Create a new user. It's called 'UserList' because normally we'd have a get
    method here too, for retrieving a list of all User objects.
    """

    permission_classes = (permissions.AllowAny,)
    http_method_names = ['get', 'head']

    def get(self, request, format=None):
        users = User.objects.all()
        serializer = UserSerializerWithToken(users, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        self.http_method_names.append("GET")

        serializer = UserSerializerWithToken(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

基本上问题是，在您的视图中没有为GET请求定义功能。你可以添加它，像这样：

class UserList(APIView):
    permission_classes = (permissions.AllowAny,)
    http_method_names = ['get', 'head', 'post']

    def get(self, request, *args, **kwargs):
        serializer = UserSerializerWithToken(User.objects.all(), many=True)
        return Response(serializer.data, status=status.HTTP_200_OK)

    def post (self, request, format=None):
        self.http_method_names.append("GET")
        serializer = UserSerializerWithToken(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

也可以从ListAPIView继承UserList View的子类。

仅供参考，permission_classes无法与APIView一起使用。您需要使用GenericAPIView或任何其他通用视图来实现这些功能。

我有同样的问题，但我注意到，在我的views.py，我有

renderer_class = api_settings.DEFAULT_RENDERER_CLASSES

我更正为：

renderer_classes = api_settings.DEFAULT_RENDERER_CLASSES

对我很有效

也许你是从你打电话的地方打电话给“post”，例如“postman”
但你的功能是

def get(self, request, *args, **kwargs):

所以调用“get”或将函数更改为

def post(self, request, *args, **kwargs):