A connector's proxy-name cannot be set through system properties currently in the web subsystem:

==domain.xml==

<subsystem xmlns="urn:jbossomain:web:1.1" default-virtual-server="default-host" instance-id="${jboss.node.name}"
native="false">
<connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http" proxy-name="${jboss.proxy.name}"/>

The property is never parsed though and
request.getServerName() just returns ${jboss.node.name}.