httpclient报错 The host did not accept the?报错

我遇到的这个问题是服务器现网日志中的，不是每次请求都报这个错。是否跟并发有关？

错误堆栈我贴在了下面。

我自己在本地模拟了一些异常情况：

因为是用的httpclient 3.1 ，我在本地自己写了测试类。

网上我查了下，说是设置的setConnectionTimeout()方法，指定连接超时时间。我不知道这个错误怎么出现了的。

我模拟了请求一个不存在的url,他报错是java.net.UnknownHostException: www.gofufu.com

我又模拟了一个存在但不能访问的url,就报我遇到的这个错。比如我访问www.facebook.com

我再模拟一个请求，这个请求在服务端睡眠1分钟，设置setSoTimeout(3000)，报Read time out.

谁能解酒我

org.apache.commons.httpclient.ConnectTimeoutException: The host did not accept the connection within timeout of 15000 ms
        at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:155)
        at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:125)
        at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
        at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
        at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
        at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)