@Override
    public void close() {
        try {
            httpClient.close();
        } catch (IOException e) {
            // TODO log the error?
        }
    }
@see io.apiman.manager.api.gateway.IGatewayLink#close()
manager/api/gateway/src/main/java/io/apiman/manager/api/gateway/rest/RestGatewayLink.java