@Override
    public boolean isCircuitTrippingException(Throwable e) {
        if (e instanceof ClientException) {
            return ((ClientException) e).getErrorType() == ClientException.ErrorType.SERVER_THROTTLED;
        }

        return super.isCircuitTrippingException(e);
    }
@return true if the Throwable has one of the following exception type as a cause: 
{@link SocketException}, {@link SocketTimeoutException}
ribbon-httpclient/src/main/java/com/netflix/niws/client/http/HttpClientLoadBalancerErrorHandler.java