agent.freeSockets
当启用 keepAlive 时,包含当前等待代理使用的套接字数组的对象。不要修改。
¥An object which contains arrays of sockets currently awaiting use by
the agent when keepAlive is enabled. Do not modify.
freeSockets 列表中的套接字将被自动销毁并从 'timeout' 上的数组中删除。
¥Sockets in the freeSockets list will be automatically destroyed and
removed from the array on 'timeout'.