无法让Jupyter为我的域使用Apache反向代理

我在Ubuntu 15.10的“/etc/apache2/sites enabled”中有以下条目

<VirtualHost *:80>
        ServerName "jupyter.xxxxxxxxxxxx.com"
        ProxyPass / http://192.168.254.23:8888/
        ProxyPassReverse / http://192.168.254.23:8888/
        Header edit Origin "jupyter.xxxxxxxxxxxx.com" 192.168.254.23:8888
        RequestHeader edit Origin "jupyter.xxxxxxxxxxxx.com" 192.168.254.23:8888

        Header edit Referer "jupyter.xxxxxxxxxxxx.com" 192.168.254.23:8888
        RequestHeader edit Referer "jupyter.xxxxxxxxxxxx.com" 192.168.254.23:8888
        <Location ~ "/(user/[^/]*)/(api/kernels/[^/]+/channels|terminals/websocket)/?">
                ProxyPass ws://192.168.254.23:8888/
                ProxyPassReverse ws://192.168.254.23:8888/
        </Location>
</VirtualHost>

192.168.254.201 jupyter.xxxxxxxxxxxx.com