How to encrypt request body content by nginx plugin

[lilihongbeast at 163.com]

Hello Team,

I learned that it can be encrypt request body content and  encrypt response body content  through encrypted-session-nginx-module(https://github.com/openresty/encrypted-session-nginx-module) in openresty.

But I need to use the nginx plugin, not openresty(Old system, it is not allowed to replace ngnix). 

I  refer to nginx-http-concat (https://github.com/alibaba/nginx-http-concat),this can be solve the   encrypt response body content.

How to encrypt request body content by nginx plugin?Which stage of HTTP can be processed?Is it NGX_HTTP_CONTENT_PHASE?Are there any examples of plugins?

Thanks!
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