"Recently updated" plugin can be used to reflect arbitrary static content to browser

<home>/plugins/recently-updated/changes.action?theme=XXXXXXXX

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Cache-Control: no-cache, must-revalidate
Expires: Thu, 01 Jan 1970 00:00:00 GMT
X-Confluence-Request-Time: 1412654577325
X-Seraph-LoginReason: OK
X-AUSERNAME: admin
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Content-Type: text/html;charset=UTF-8
Date: Tue, 07 Oct 2014 04:02:57 GMT
Content-Length: 277

    <ul>
            <li class="update-item update-item-error">XXXXXXXX
 no supported.</li>
        </ul>