Refactor config for better readability

**Feature request**
It would be great to have encryption for handlers.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_encryption` with default `false`.

Start by locating the configuration handling and the handler setup in the repository, then trace how handler behavior is selected for production deployments. Confirm the intended encryption behavior and where the new enable_encryption option belongs before changing anything. Done means the option defaults to false and the encryption behavior is covered by appropriate tests.

Written by the indexing model from the issue text.