如何对openresty响应加入水印？

[jian wang]

如题，有大神提供下思路吗？

[Junlong Li]

应该更加详细一点的，方便大家讨论。

On Friday, March 10, 2023 at 2:09:37 PM UTC+8 success...@gmail.com wrote:

如题，有大神提供下思路吗？

[Joseph Martinez]

For whatever reason

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[Louis He]

Try 

https://github.com/ittner/lua-gd

 Is really need to processing images in real time?

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[jian wang]

主要是对excel文件进行保存。主要思路是：先保存excel文件，再利用别的程序对文件加水印，最后返回。但是如何保存excel文件呢？

[Junlong li]

you can save the file in the body_filter_by_lua_block, but it is slow.