This handler sets ServletRequest#getRemoteHost() etc. values in Undertow. In Wildfly code this handler is actually enabled with the listener attribute proxy-address-forwarding=true:

https://github.com/wildfly/wildfly/blob/aaaeb2a13667353db2b6955b9bcdba434a89fd02/undertow/src/main/java/org/wildfly/extension/undertow/HttpListenerService.java#L93

What's the difference between enabling the listener attribute and adding the filter manually?

None of this is having any effect on getRequestURL(). There are two ways I see how this host is set: From parsing the HTTP request line or from the Host header.

Whatever proxy testing you do probably works because your proxy passes through the original Host header. Preserving the Host header is the default in haproxy but not mod_proxy.

On 23.05.2016, at 16:14, Bill Burke <bburke@redhat.com> wrote:
https://keycloak.gitbooks.io/server-installation-and-configuration/content/topics/clustering/load-balancer.html
As Stian said, ProxyPeerAddressHandler? See above.

On 5/23/16 3:16 AM, Christian Bauer wrote:
08:47:32,512 ERROR [stderr] (default task-2) X-Forwarded-For: 10.0.0.1

Copy/paste error, the actual line is:

08:47:32,512 ERROR [stderr] (default task-2) X-Forwarded-For: 10.0.0.1:8888
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