replace-response VS lua-nginx-module

> But there are many scenarios where being able to extend the HTTP server via Lua is more convenient than writing a plugin I would think?

Well, Caddy is written in Go, so it's only natural to write a plugin in Go. Statically compiled into your binary. We provide a tool called `xcaddy` which is used to produce builds of Caddy with any plugins you need. You just need Go installed on your system to run it, no other dependencies.

The reason why Lua is used for OpenResty is because writing plugins in C is... not fun.

You can absolutely do what you described with an HTTP handler module in Caddy. You'd just wrap the req.Body with a reader that watches the bytes as they're copied through the stream, and when you see the part you want to log, you do that.

We have a replace-response plugin which takes a similar approach, except it manipulates the response as it's being streamed back to the client. https://github.com/caddyserver/replace-response The whole plugin is just one file of Go code.

"small embeddable dynamic languages" are usually used to configure or program other larger compiled applications. This is bes understood by example:

https://create.roblox.com/docs/tutorials/scripting/basic-scr... - make a mini game in Roblox

https://github.com/openresty/lua-nginx-module?tab=readme-ov-... - configure and extend NGINX

https://wezfurlong.org/wezterm/config/lua/general.html - make your terminal more useful (my personal config changes the tab color based on the process name - https://github.com/bbkane/dotfiles/blob/master/wezterm/dot-c...

https://m.youtube.com/watch?v=MQBr9hwf0BY - configure your text editor

If your service is self-hosted, you can build the rate limit rules in Nginx using the OpenResty framework. Note that, if you are using OpenResty, you can use a shared dictionary and you don't necessarily need Redis. However, if you want to use redis though, then you need a redis client like the lua-resty-redis.

You may also wish to open a question on the OpenResty repo, as there are not many OpenResty folks that follow this subreddit.

/u/givmedat - Your best bet is to use njs module or the nginx lua module I think.

I drop logs at the first app LB using openresty's lua plugin for nginx. This goes into my data lake and we work on it from there. Does this work for everyone? No. Does it work for my F500 employer? Yes. Are there better ways to do this? Sorta.

# - https://github.com/openresty/lua-nginx-module/

We want the client to read the YAML file regularly. For this, we can leverage the power of the Lua Nginx module. It's part of OpenResty, which Apache APISIX is built upon. The module offers additional APIs, and two of them are particularly useful:

Depending on how complicated your Python logic is, one option is to use nginx+Lua (https://github.com/openresty/lua-nginx-module). Another option is to extend Envoy (https://www.envoyproxy.io/docs/envoy/latest/extending/extending).