此错误通常由服务器中断连接引起。解决方法是设置连接保持活动状态，通过如下代码：

CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
// 设置保持活动状态
httpPost.setHeader("Connection", "keep-alive"); 
CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

如果服务器支持 HTTP1.1 协议，也可以增加如下代码：

CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
// 设置保持活动状态和最大空闲时间
httpPost.setHeader("Connection", "keep-alive"); 
httpPost.setHeader("Keep-Alive", "timeout=5, max=20"); 
CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

其中，timeout 表示最大空闲时间，max 表示最大请求数。