public static InetSocketAddress getServerAddress(Object proxy) {
    return getConnectionIdForProxy(proxy).getAddress();
  }
@Test
  public void testProxyAddress() throws Exception {
    Server server = null;
    TestRpcService proxy = null;

    try {
      server = setupTestServer(conf, -1);
      // create a client
      proxy = getClient(addr, conf);
      assertEquals(addr, RPC.getServerAddress(proxy));
    } finally {
      stop(server, proxy);
    }
  }