语法: count, err = tcpsock:getreusedtimes()
环境: rewrite_by_lua, access_by_lua*, content_by_lua*, ngx.timer.**
该方法返回当前连接的使用次数（调用成功）。失败时，返回nil和错误描述字符信息。
如果当前连接不是从内建连接池中获取的，该方法总是返回 0 ，也就是说，该连接还没有被使用过。如果连接来自连接池，那么返回值永远都是非零。所以这个方法可以用来确认当前连接是否来自池子。
该特性是在 v0.5.0rc1 版本首次引入的。
English source:
syntax: count, err = tcpsock:getreusedtimes()
context: rewrite_by_lua, access_by_lua*, content_by_lua*, ngx.timer.**
This method returns the (successfully) reused times for the current connection. In case of error, it returns nil and a string describing the error.
If the current connection does not come from the built-in connection pool, then this method always returns 0, that is, the connection has never been reused (yet). If the connection comes from the connection pool, then the return value is always non-zero. So this method can also be used to determine if the current connection comes from the pool.
This feature was first introduced in the v0.5.0rc1 release.