http相关的知识讲解

https://www.cnblogs.com/klb561/p/9221754.html

http://note.youdao.com/noteshare?id=ab36642cecd6d9e89203baddc615097f

http://note.youdao.com/noteshare?id=e0c84663ce7c62ea8634771924f3d0e3

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