[undertow-dev] Undertow responding to unknown host

Hi, I am using Wildfly 8.2 Final. I am using the default Undertow subsystem configuration - <subsystem xmlns="urn:jboss:domain:undertow:1.2"> <buffer-cache name="default"/> <server name="default-server"> <http-listener name="default" socket-binding="http"/> <host name="default-host" alias="localhost"> <location name="/" handler="welcome-content"/> <filter-ref name="server-header"/> <filter-ref name="x-powered-by-header"/> </host> </server> <servlet-container name="default"> <jsp-config/> <websockets/> </servlet-container> <handlers> <file name="welcome-content" path="${jboss.home.dir}/welcome-content"/> </handlers> <filters> <response-header name="server-header" header-name="Server" header-value="WildFly/8"/> <response-header name="x-powered-by-header" header-name="X-Powered-By" header-value="Undertow/1"/> </filters> </subsystem> As you see I do not have any aliases apart from the localhost. I have a local DNS entry which points acme.example.com<http://acme.example.com> to the IP Address of the Wildfly Server/Host. When I try to fetch a page http://acme.example.com:8080/SVWeb/index.html, I do get the page back. While undertow does not know about this host, how is it that I get the content back? The Host header in the HTTP request is indeed - Host: “acme.example.com<http://acme.example.com>:8080" Should I use any filters or access control to let Undertow know not serve unknown hosts? Thanks and Best Regards, GPN