Release the Connection：释放连接
This is a crucial step to keep things flowing. We must tell HttpClient that we are done with the connection and that it can now be reused. Without doing this HttpClient will wait indefinitely for a connection to free up so that it can be reused.
释放连接是使系统持续运行的一个十分关键的步骤。我们必须显式地告诉HttpClient，我们已经用完了一个连接并且这个连接已经可以被收回+复用了。如果不做这个动作，HttpCllient会一直无限地等待连接被释放，然后复用它。
关键代码：
method.releaseConnection();
请将上面的代码放在finally代码块中
HttpClient 释放连接
原文地址：https://www.cnblogs.com/shuada/p/9434049.html