【Django】The view userWeb.views. didn‘t return an HttpResponse object. It returned None instead.

报错：

ValueError at /testoperatesession
The view userWeb.views.testOperateSession didn't return an HttpResponse object. It returned None instead.
Request Method:	GET
Request URL:	http://127.0.0.1:8000/testoperatesession
Django Version:	3.2.3
Exception Type:	ValueError
Exception Value:	
The view userWeb.views.testOperateSession didn't return an HttpResponse object. It returned None instead.

因为代码里，HttpResponse、JsonResponse等前面，要加return！！！

return HttpResponse("参数不足")