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HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();CloseableHttpClient closeableHttpClient = httpClientBuilder.build();RequestConfig defaultRequestConfig = RequestConfig.custom().build();RequestConfig requestConfig = defaultRequestConfig.copy().setSocketTimeout(5000)    .setConnectTimeout(5000)    .setConnectionRequestTimeout(5000)    .setProxy(new HttpHost("web-proxy.houston.hp.com", 8080)).build();HttpGet httpGet = new HttpGet(url);httpGet.setConfig(requestConfig);try {    HttpResponse httpResponse = closeableHttpClient.execute(httpGet);        HttpEntity entity = httpResponse.getEntity();        if (entity != null) {        response = EntityUtils.toString(entity);        return response;    }} catch (IOException e) {    e.printStackTrace();} finally {    try {        closeableHttpClient.close();    } catch (IOException e) {        e.printStackTrace();    }}return response;

以上代码示例展示了如何使用Java的HttpClient库发送HTTP GET请求，并处理响应。以下是详细的注释说明：

代码示例展示了如何在Java程序中使用HttpClient库进行网络请求。通过合理配置请求设置，可以确保网络请求的稳定性和可靠性。代码中使用了try-catch-finally结构，确保资源的及时释放和异常的处理。

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