return false;
    }

    public static boolean isCriticalFailure(Throwable throwable) {
        Throwable rootCause = Throwables.getRootCause(throwable);
        return isTimeoutException(rootCause) || isUnrecoverable5xxStatusCode(rootCause);
    }

    /**
     * See <a href="http://hc.apache.org/httpclient-3.x/exception-handling.html">HTTPClient exception handling</a> for more information.
     */