Confluence is not using the seraph logout url to define how to log out.

We need to update our use of seraph to delegate the definition of the logout url to seraph-config.xml

Workaround for Confluence 5.7.2 and older

1. Find and copy <confluence_install>/confluence/WEB-INF/lib/confluence-x.x.x.jar to a temp location (with "x.x.x" representing your Confluence version number)
2. Extract the file: jar -xf confluence-x.x.x.jar
3. Open xwork.xml in an editor and locate this section:

   <action name="logout" class="com.atlassian.confluence.user.actions.LogoutAction">
               <interceptor-ref name="defaultStack"/>
               <result name="error" type="velocity">/logout.vm</result>
               <result name="success" type="redirect">/login.action?logout=true</result>
           </action>
   

4. Replace the redirect URL for success result to the desired URL, e.g.:

               <result name="success" type="redirect">/my_custom_url.html</result>
   

5. Save the file, and copy it to <confluence_install>/confluence/WEB-INF/classes/
6. Restart Confluence