HttpClients.custom的創建

/**
 * 創建httpClient
 */
CloseableHttpClient httpclient = HttpClients.custom()
                                 .setConnectionManager(connManager)             //連接管理器
                                 .setDefaultRequestConfig(defaultRequestConfig) //默認請求配置
                                 .setRetryHandler(myRetryHandler)               //重試策略
                                 .build();