java - HttpEntity 在关闭后重置并抛出 java.net.SocketException

Question

  public static String sendRequest(UUICRequest requset) throws
      ClientProtocolException, IOException
  {
    RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(10 * 1000).build();
    CloseableHttpClient httpClient = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).build();
    HttpGet httpGet = new HttpGet(requset.toUrl());
    CloseableHttpResponse response = httpClient.execute(httpGet);
    HttpEntity entity = response.getEntity();
    response.close();
    httpClient.close();
    return EntityUtils.toString(entity, "UTF-8");
  }

它抛出 java.net.SocketException: socket closed。

我逐行调试运行这个程序，发现entity在执行时发生了变化:

    response.close();
    httpClient.close();

所以我重写了我的代码:

  public static String sendRequest(UUICRequest requset) throws
      ClientProtocolException, IOException
  {
    RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(10 * 1000).build();
    CloseableHttpClient httpClient = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).build();
    HttpGet httpGet = new HttpGet(requset.toUrl());
    CloseableHttpResponse response = httpClient.execute(httpGet);
    HttpEntity entity = response.getEntity();
    String ret = EntityUtils.toString(entity, "UTF-8");//+
    response.close();
    httpClient.close();
    return ret;//M
  }

此代码按预期工作并成功结束。

我的问题是，为什么httpclient会在关闭response和httpClient后重置entity？

Answer 1

My question is, why httpclient will reset entity after closing response and httpClient?

流式 HTTP 实体(例如返回 HttpResponse 的实体)附加到底层连接，以便能够在没有任何中间缓冲的情况下流式传输数据。在响应内容完全使用之前关闭 HttpResponse 会导致基础连接重置。