Handle edge cases in compression

**Problem**
When working with controllers, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

The issue names controllers, compression, and error handling but no files, tests, or entry points. Start by locating the controller paths that handle compression and inspect their current errors. Done means the relevant edge cases produce more descriptive error messages and error handling is improved, with coverage added if the existing project structure indicates where it belongs.

Written by the indexing model from the issue text.