let nginx determine content type

panikweb/views.py

@@ -1124,7 +1124,7 @@ chat = cache_control(max_age=15)(Chat.as_view())
 
 def media_hosting(request, location, *args, **kwargs):
     local_path = default_storage.path(location)
-    response = HttpResponse()
+    response = HttpResponse(content_type='')
     if os.path.exists(local_path):
         response['X-Accel-Redirect'] = settings.OFFSITE_MEDIA_SOUNDS[0] + location
     else: