apollo-common/src/main/java/com/ctrip/framework/apollo/common/utils/ExceptionUtils.java/ExceptionUtils/toString
class ExceptionUtils:  public static String toString(HttpStatusCodeException e) {
    Map<String, Object> errorAttributes = gson.fromJson(e.getResponseBodyAsString(), mapType);
    if (errorAttributes != null) {
      return MoreObjects.toStringHelper(HttpStatusCodeException.class).omitNullValues()
          .add("status", errorAttributes.get("status"))
          .add("message", errorAttributes.get("message"))
          .add("timestamp", errorAttributes.get("timestamp"))
          .add("exception", errorAttributes.get("exception"))
          .add("errorCode", errorAttributes.get("errorCode"))
          .add("stackTrace", errorAttributes.get("stackTrace")).toString();
    }
    return "";
  }