Bug context : Ubuntu 14.04.2, Python 2.7.6, Ceph 0.87.1, Apache 2.4.7, WSGI 3.4-4ubuntu2

When calling S3ObjectCtrl, several instructions raised TypeError exceptions :

[Fri Feb 27 11:52:13.074549 2015] [:error] [pid 5634:tid 139929489237760] DEBUG    Calling  getObjectStructure() method
[Fri Feb 27 11:52:13.122516 2015] [:error] [pid 5634:tid 139929489237760] ERROR    Exception on /S3/object [GET]
[Fri Feb 27 11:52:13.122551 2015] [:error] [pid 5634:tid 139929489237760] Traceback (most recent call last):
[Fri Feb 27 11:52:13.122557 2015] [:error] [pid 5634:tid 139929489237760]   File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app
[Fri Feb 27 11:52:13.122562 2015] [:error] [pid 5634:tid 139929489237760]     response = self.full_dispatch_request()
[Fri Feb 27 11:52:13.122587 2015] [:error] [pid 5634:tid 139929489237760]   File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1477, in full_dispatch_request
[Fri Feb 27 11:52:13.122592 2015] [:error] [pid 5634:tid 139929489237760]     rv = self.handle_user_exception(e)
[Fri Feb 27 11:52:13.122597 2015] [:error] [pid 5634:tid 139929489237760]   File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1381, in handle_user_exception
[Fri Feb 27 11:52:13.122601 2015] [:error] [pid 5634:tid 139929489237760]     reraise(exc_type, exc_value, tb)
[Fri Feb 27 11:52:13.122606 2015] [:error] [pid 5634:tid 139929489237760]   File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1475, in full_dispatch_request
[Fri Feb 27 11:52:13.122610 2015] [:error] [pid 5634:tid 139929489237760]     rv = self.dispatch_request()
[Fri Feb 27 11:52:13.122614 2015] [:error] [pid 5634:tid 139929489237760]   File "/usr/lib/python2.7/dist-packages/flask/app.py", line 1461, in dispatch_request
[Fri Feb 27 11:52:13.122619 2015] [:error] [pid 5634:tid 139929489237760]     return self.view_functions[rule.endpoint](**req.view_args)
[Fri Feb 27 11:52:13.122623 2015] [:error] [pid 5634:tid 139929489237760]   File "/var/www/inkScope/inkscopeCtrl/inkscopeCtrlcore.py", line 110, in getObjectStructure
[Fri Feb 27 11:52:13.122628 2015] [:error] [pid 5634:tid 139929489237760]     return Response(S3ObjectCtrl(conf).getObjectStructure(),mimetype='application/json')
[Fri Feb 27 11:52:13.122632 2015] [:error] [pid 5634:tid 139929489237760]   File "/var/www/inkScope/inkscopeCtrl/S3ObjectCtrl.py", line 37, in __init__
[Fri Feb 27 11:52:13.122637 2015] [:error] [pid 5634:tid 139929489237760]     self.cluster = rados.Rados(conffile=self.conffile)
[Fri Feb 27 11:52:13.122641 2015] [:error] [pid 5634:tid 139929489237760]   File "/usr/lib/python2.7/dist-packages/rados.py", line 213, in __init__
[Fri Feb 27 11:52:13.122646 2015] [:error] [pid 5634:tid 139929489237760]     raise TypeError('conffile must be a string or None')
[Fri Feb 27 11:52:13.122650 2015] [:error] [pid 5634:tid 139929489237760] TypeError: conffile must be a string or None

And the same for lines 177 and 393 with self.cluster.open_ioctx(poolName)

Debug showed that these arguments were unicode strings, so using str() solved the issue.