Improve error messages in controllers

**Feature request**
It would be great to have caching for routes.

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

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

The issue names no files, tests, or entry points, and its title conflicts with the feature request. Start by locating route handling and configuration entry points, then determine how caching should integrate; done means an `enable_caching` option defaults to `false` and the requested route caching behavior is covered by tests.

Written by the indexing model from the issue text.