modules/proxy/mod_proxy_express.c:152: error: UNINITIALIZED_VALUE
  The value read from backend was never initialized.

modules/proxy/mod_proxy_express.c:152:31: 
150.     }
151.     apr_dbm_close(db);
152.     if (rv != APR_SUCCESS || !backend) {
                                   ^
153.         return DECLINED;
154.     }
