Undertow mod_cluster proxy enforces aliases checks a.k.a. UseAlias:true ----------------------------------------------------------------------- Key: WFLY-4954 URL: https://issues.jboss.org/browse/WFLY-4954 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 10.0.0.Alpha4 Reporter: Michal Karm Babacek Assignee: Michal Karm Babacek Fix For: 10.0.0.Beta2 If one uses hostnames and a worker registers itself e.g. as {{Host=karm.brq.redhat.com}} the Undertow mod_cluster proxy enforces exact alias matching, which corresponds to Apache HTTP Server mod_cluster module implementation directive [UseAlias|http://docs.jboss.org/mod_cluster/1.2.0/html_single/#d0e505] being set to 1 (enforcing). h4. Symptoms Thus registered worker's context: {noformat} INFO [io.undertow] (default task-3) registering context /clusterbench, for node worker-1, with aliases [default-host, localhost] {noformat} causes HTTP 404 errors both while trying to access the context on IP address or hostname. This worker: {noformat}INFO [io.undertow] (default task-20) registering context /clusterbench, for node worker-1, with aliases [default-host, karm.brq.redhat.com] {noformat}, with one of its aliases being {{karm.brq.redhat.com}} could be accessed via the Undertow mod_cluster proxy without problems. h4. Call to action We need to decide whether this difference in default behaviour is desirable or not and act accordingly. WDYT?