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.
     */
    private static boolean isTimeoutException(Throwable rootCause) {
        return rootCause instanceof InterruptedIOException;
    }