，核心代码，挺详细的，考虑比较周到，隐士观察下来，还缺少设定timeout，还缺proxy部分，因为JSpider已经支持proxy，不过是用java内置的方法-JSiper

In the 25+ years the TCP/IP protocol family has been deployed on the internet, it has often faced new problems and challenges. Even today, new extensions such as ECN and TCPs user timeout option, are being added to the core protocols. Newer net