I found no way to remove the Server header in EAP6. But there is a way to change its content. Just add the folling config to your standalone.xml:
<system-properties> <property name="org.apache.coyote.http11.Http11Protocol.SERVER" value="foo"/> </system-properties>
Or with cli:
/system-property=org.apache.coyote.http11.Http11Protocol.SERVER:add(value=foo)
Then your header just is Server: foo instead.