教程请访问这个网址：https://www.yuque.com/demososo/book/bql4eb  

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有的bluehost主机，播放视频出现下面错误Mod_Security：

Not Acceptable!

An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.

则联系主机商解决问题，或参考这个文章：  https://www.webtoffee.com/how-to-fix-the-mod_security-generated-error-on-your-site/ 

或下面方法关闭Mod_Security：