code: def set_state_view(self, request):
          
          if not request.user.has_perm('experiments.change_experiment'):
              return HttpResponseForbidden()
  
          try:
              state = int(request.POST.get("state", ""))
          except ValueError:
              return HttpResponseBadRequest()
  
          try:
              experiment = Experiment.objects.get(name=request.POST.get("experiment"))
          except Experiment.DoesNotExist:
              return HttpResponseBadRequest()
  
          experiment.state = state
  
          if state == 0:
              experiment.end_date = timezone.now()
          else:
              experiment.end_date = None
  
          experiment.save()
  
          return HttpResponse()
docs: Changes the experiment state