http://mattrichardson.com/Raspberry-Pi-Flask/
http://ju.outofmemory.cn/entry/56352
https://www.embbnux.com/2014/10/07/user_flask_to_control_raspberry_gpio_on_web/
http://mattrichardson.com/Raspberry-Pi-Flask/
http://ju.outofmemory.cn/entry/56352
https://www.embbnux.com/2014/10/07/user_flask_to_control_raspberry_gpio_on_web/