Container setup webpage fails to redirect during debloating

I'm currently building a slimmed mediawiki image, and would like to run the initial setup within docker-slim so that it can access all the critical paths effectively, however for some reason, it is unable to handle the redirects from the installer.

Expected Behavior

The installer for mediawiki runs as it normally would, and leaves me with a container that is initialized with admin credentials.

Actual Behavior

The mediawiki gets stuck at the language selection, and is unable to proceed.

Steps to Reproduce the Problem

1. Pull the mediawiki docker image

docker pull mediawiki

2. start mediawiki in docker-slim

docker-slim build --publish-port 8080:80 --http-probe=false --continue-after enter mediawiki

3. Navigate to http://localhost:8080/
4. select "Setup the wiki"
5. Choose a language, and click "continue"

Ath this point, the container should fail to redirect to the next step. running outside of docker-slim, this works without issue, and seems to be specific to slim's environment

Specifications

• Version: docker-slim version linux|Transformer|1.37.0|70cc8acfcb733161ce7e685b81ad6c172643c222|2021-09-23_09:23:43AM

• Platform: Linux

Start by reproducing the failure with the documented docker-slim build command, then compare the installer flow at http://localhost:8080/ with a normal MediaWiki container. Trace the language-selection redirect and identify what differs in the slimmed environment. Done means the setup reaches completion and initializes admin credentials under docker-slim.