How to set proxy settings on RESTEasy client in JBoss EAP 7?

Issue

• The org.jboss.resteasy.jaxrs.client.proxy.host and org.jboss.resteasy.jaxrs.client.proxy.port can't enable the proxy settings via javax.ws.rs.client.ClientBuilder on EAP 7.2.
• RESTEasy is not honoring -D params for proxy. i.e. -Dhttp.proxyHost=proxy.xx.xx.com -Dhttp.proxyPort=8080 -Dhttps.proxyHost=proxy.xx.xx.com -Dhttps.proxyPort=8080
• Adding Client.property(ClientProperties.PROXY_URI, "http://proxy.xx.xx.com:8080") is not honored for setting a proxy on the Client API
• We have a generic api that also supports Jersey and Tomcat in some project, so it can't reference RESTEasy directly to set the proxy. how can't set the proxy is a generic way?