再谈使用Commons HttpClient产生大量CLOSE_WAIT

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默认情况下(即用默认构造方法建立HttpClient对象)，httpMethod.releaseConnection()方法并不会关闭连接的Socket，目的是可以重用这个连接。网上有不少讨论：

这些讨论里提出了关闭Socket的方法，即在请求头里加上”Connection: close”，具体可见HTTP协议规范里的说明。

其实HttpClient 3.x 里还可以通过下面的方式建立HttpClient对象，来保证关闭Socket连接：

  1. HttpClient httpClient = new HttpClient(new SimpleHttpConnectionManager(true));

具体可见HttpClient源码和API文档。

当然，使用HttpClient的多线程连接管理器时就不用这么做了。

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