6.4.3 七步实现finger 服务（3）
Telnet 测试
在一个命令行窗口运行：
- $ ./bin/twisted_finger07
再试一次：
- $ telnet localhost 1079
- Trying ::1...
- Trying 127.0.0.1...
- Connected to localhost.
- Escape character is '^]'.
- muduo
- No such user
- Connection closed by foreign host.
冒烟测试过关。
- $ telnet localhost 1079
- Trying ::1...
- Trying 127.0.0.1...
- Connected to localhost.
- Escape character is '^]'.
- schen
- Happy and well
- Connection closed by foreign host.