As mentioned in comment #2, the page and per_page parameters should be removed from http://developer.openstack.org/api-ref-identity-v3.html as they are not, and have never been, supported by keystone.
As mentioned in comment #2, the page and per_page parameters should be removed from http:// developer. openstack. org/api- ref-identity- v3.html as they are not, and have never been, supported by keystone.