HTTP和HTTPS

参见：

https://juejin.im/post/5af557a3f265da0b9265a498#heading-29

https://www.cnblogs.com/li0803/archive/2008/11/03/1324746.html

https://juejin.im/post/5d3970f5e51d45105e0213b8

 

网络面试知识点参见：

　　https://juejin.im/post/5b5f20686fb9a04f844adbdd#heading-13