ExceptionHelper.java 文件源码

public static boolean isServerUnavailableException(Throwable cause) {
    return isHttpException(cause, 503) ||
            (isException(cause, ConnectException.class)
            || isException(cause, NoRouteToHostException.class)
            || isException(cause, PortUnreachableException.class)
            || isException(cause, SocketTimeoutException.class));
}