liferay portal does not work

Hello.

I have commpiled the full wildfly package and set gerrit, jenkins, and the nexus repo manager on it, all works perfectly.
The problem:
I tried to deploy liferay on the same instance.
I did everything and then deployed the webapp.
The deploy was successful, but it didn't work.
I have the appserver behind apache reverse proxy, trying to load a page displays error 502 proxy error.
I checked with telnet what happens by telnetting to the backend appserver and sending a GET request for /.
The response was incorrect, I got the expected document but without the status line and headers, that makes it clear why apache sait error 502.
Liferay probably works with jboss as 7 and tomcat/etc, so I think undertow must have something to do with it