apache config in nova-placement-api has missing parameter

I'm trying OpenStack Ocata on xenial. And I faced 404 response when components of nova access nova-placement-api.
The endpoint URL is "http://controller/placement".

nova-placement-api/xenial-updates,now 2:15.0.2-0ubuntu1~cloud0 places a apache2 virtual host config in /etc/apache2/sites-available/nova-placement-api.conf.

These below lines should be added in the config.

===
Alias /placement /usr/bin/nova-placement-api
<Directory /usr/bin>
    <IfVersion >= 2.4>
        Require all granted
    </IfVersion>
    <IfVersion < 2.4>
        Order allow,deny
        Allow from all
    </IfVersion>
</Directory>
<Location /placement>
  SetHandler wsgi-script
  Options +ExecCGI
  WSGIProcessGroup nova-placement
  WSGIApplicationGroup %{GLOBAL}
  WSGIPassAuthorization On
</Location>
===