apollo-common/src/main/java/com/ctrip/framework/apollo/common/http/RichResponseEntity.java/RichResponseEntity/error
class RichResponseEntity:  public static <T> RichResponseEntity<T> error(HttpStatus httpCode, Object message){
    RichResponseEntity<T> richResponseEntity = new RichResponseEntity<>();
    richResponseEntity.message = message;
    richResponseEntity.code = httpCode.value();
    return richResponseEntity;
  }