List which handlers needs to be refactored to the middleware format

Context

We currently have 2 undocumented refactoring happening:

1. Migrating handlers which return true/false as the sign of the request being finished to middlewares which do their thing and pass the execution to the next middleware
2. Migrating the routing code from the main package to the handlers package.

More information: &8116 (comment 993805250)

Expected outcome

To make these efforts more clear, we need to compile a list of what yet needs to be done for these migrations.