protected void initHttpClient(HttpClientConfig config) {
    HostConfiguration hostConfiguration = new HostConfiguration();
    hostConfiguration.setHost(config.getHost(), config.getPort());

    connectionManager = new MultiThreadedHttpConnectionManager();
    connectionManager.closeIdleConnections(config.getPollingIntervalTime() * 4000);

    HttpConnectionManagerParams params = new HttpConnectionManagerParams();
    params.setStaleCheckingEnabled(config.isConnectionStaleCheckingEnabled());
    params.setMaxConnectionsPerHost(hostConfiguration, config.getMaxHostConnections());
    params.setMaxTotalConnections(config.getMaxTotalConnections());
    params.setConnectionTimeout(config.getTimeout());
    params.setSoTimeout(60 * 1000);

    connectionManager.setParams(params);
    httpclient = new HttpClient(connectionManager);
    httpclient.setHostConfiguration(hostConfiguration);
  }