java - CloseableHttpResponse.close()和httpPost.releaseConnection()有什么区别？

CloseableHttpResponse response = null;
try {
    // do some thing ....
    HttpPost request = new HttpPost("some url");
    response = getHttpClient().execute(request);
    // do some other thing ....
} catch(Exception e) {
    // deal with exception
} finally {
    if(response != null) {
        try {
            response.close(); // (1)
        } catch(Exception e) {}
        request.releaseConnection(); // (2)
    }
}

我已经如上所述发出了http请求。

为了释放基础连接，调用(1)和(2)是否正确？两次调用有什么区别？

最佳答案

简短答案:
request.releaseConnection()释放基础HTTP连接，以允许其重用。 response.close()正在关闭一个流(不是连接)，该流是我们从网络套接字流式传输的响应内容。

长答案:

在任何大于4.2的最新版本中(甚至可能在此之前)遵循的正确模式是不使用releaseConnection。
request.releaseConnection()释放底层的httpConnection，以便可以重用该请求，但是Java文档说:



我们确保释放响应内容，而不是释放连接，从而确保释放连接并准备重用。一个简短的示例如下所示:

CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://targethost/homepage");
CloseableHttpResponse response1 = httpclient.execute(httpGet);
try {
    System.out.println(response1.getStatusLine());
    HttpEntity entity1 = response1.getEntity();
    // do something useful with the response body
    String bodyAsString = EntityUtils.toString(exportResponse.getEntity());
    System.out.println(bodyAsString);
    // and ensure it is fully consumed (this is how stream is released.
    EntityUtils.consume(entity1);
} finally {
    response1.close();
}