http教程

1. https://www.runoob.com/http/http-intro.html (菜鸟教程, http简介)
   https://baike.baidu.com/item/CGI/12648899?fr=aladdin (CGI) <通用网关接口>
2. https://www.w3cschool.cn/http/http-header-fields.html (w3school, HTTP 响应头信息)
3. https://blog.csdn.net/github_38885296/article/details/86556101 (自定义http头部的应用场景)
4. https://blog.csdn.net/gdutliuyun827/article/details/17264259 (HTTP协议与HTTP表单传输格式，再论get、post方法)