WildFly 8.1.0 Final Windows Server 2012 R2
I have two sub-domains pointing at this server, and I want requests to each sub-domain to trigger a different war file
I tested a setup similar to yours on Ubuntu 14.04 with WildFly 8.1.0.Final and Firefox 30, and for me, it works after adding a WEB-INF/jboss-web.xml to one my wars:
other-host
I defined two different host aliases for the same IP in my /etc/hosts, and my browser gets redirected to the different web apps for http://alias1:8080 and http://alias2:8080 as expected.