At account quota, "Forbidden Reached container limit of " message is printed imporpiamente

[dba]

I have set max_containers_per_account = 10 in proxy-server.conf.

and then I created 10 container.

# swift post cont1
...
# swift post cont10
Error trying to create container 'cont1': 403 Forbidden: Reached container limit of 10

At tenth container creation error is no problem. correct.

But,In this situation, When already existing cont1 upload same error message printed.

swift upload cont1 1mfile
Error trying to create container 'cont1': 403 Forbidden: Reached container limit of 10
1mfile

This error message is improper.
Although reached max container limit , in existing container must can upload.
so "Error trying to create container 'cont1': 403 Forbidden: Reached container limit" must not print.