keepalive，是在TCP中一个可以检测死连接的机制。
以上来源于: WordNet
Long keepalive: The keep-alive interval.
long keepalive：保持活动的间隔。
The last parameter, keepalive, is a value of type short whose units are seconds.
最后一个参数keepalive是一个单位为秒的short类型的值。
Should you consider using HTTP Keepalive for best performance when communicating with the remote end?
与远程终端通信时，应该考虑使用HTTP Keepalive实现最佳性能？
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