How to start writing an Nginx Module

Question

To develop an Nginx Module, receive the POST file, and then write the file content to the hard disk.
After searching for information, there is no tutorial online. . .
Does anyone have any introductory documentation?

Answer 1

Start by reading the nginx tutorial written by agentzh.

http://blog.sina.com.cn/openresty

Answer 2

There are also two translations here http://www.jiajun.org/search/nginx/ for reference