https://discourse.igniterealtime.org/
You can barely see it in the usual angle, but the gray text is there. Not in the source. I guess this comes from some script. Maybe
src/main/webapp/WEB-INF/web.xml
<param-name>csc_baseurl</param-name>
<param-value>https://igniterealtime.jiveon.com</param-value>
</context-param>
<filter>