QUESTION: How to set a reverse proxy with Undertow

I need to configure Undertow to work as a reverse proxy. Its a laboratory experience and security is not important right now. i have a domain, mydomain.com e its correctly pointed to my public ip adress. I want to acess the welcome page of wildfly and then management console. With nginx was super easy, but i really want to do it with Undertow. It must be Undertow. Im self-taught guy and you already know that im a oob, avery curious and obssessed one. My latest atempt, it did not work. the error says: WFLYCTL0193: Failed executing subsystem undertow boot operations.