pwa: force json request to be read as text (#35425)

combo/apps/pwa/views.py

@@ -87,7 +87,7 @@ def subscribe_push(request, *args, **kwargs):
         return HttpResponseForbidden()
     if request.method != 'POST':
         return HttpResponseForbidden()
-    subscription_data = json.loads(request.body)
+    subscription_data = json.loads(force_text(request.body))
     if subscription_data is None:
         PushSubscription.objects.filter(user=request.user).delete()
     else: