@Override
        protected PasswordAuthentication getPasswordAuthentication() {
          return new PasswordAuthentication(proxyUser, proxyPass.toCharArray());
        }
Sets up proxy authentication.  This must be done before the server is
initialized since <code>AmbariMetaInfo</code> requires potential URL
lookups that may need the proxy.
ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariServer.java