Support for manipulating response body in Python PDK

[Hicham-Chahboune]

Hello,

I'm developing a Kong plugin using the Python PDK. One of the requirements of my plugin is to manipulate the response body, similar to how it's done in the Lua PDK with ngx.arg[1] during the body_filter phase. (or response.set_raw_body)

However, I've noticed that the Python PDK doesn't seem to support the body_filter phase or provide a direct way to interact with the response body in chunks

[fffonion]

Hi @Hicham-Chahboune , response.set_raw_body is not supported in external plugins, however you can consider using response.exit instead.

[Hicham-Chahboune]

Thank you for your response. The issue with "response.exit" is that it interrupts the execution process of plugins. When a plugin calls "response.exit," it prevents the process from passing to other plugins

[fffonion]

@Hicham-Chahboune That is correct. Unfortunately that's the limitation we have.

[Hicham-Chahboune]

And with Lua, is it possible to change the content of the body? I tried to assign a new value to ngx.arg[1], but it doesn't work. When I manipulate the content without changing it, it works (for example, using ngx.arg[1] = string.upper(body) works). However, when I try to assign a new variable like newbody, it does not work (for example, using ngx.arg[1] = newbody)

[fffonion]

yes in lua it's supported, the more detailed documentation is at openresty side (ref: https://github.com/openresty/lua-nginx-module#body_filter_by_lua_block)

[ludovic-pourrat]

Any updates or chance to update the response ? The exit is not suitable and does not work in the context of the AI proxy.

[Robyt96]

I'm also trying to integrate some custom plugin with the AI proxy and being able to use the body_filter function would be useful.