Improve middleware performance

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

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

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

Start by locating the middleware validation and error-handling entry points in the repository and reviewing how their current messages are produced. Clarify whether the intended completion is improved validation wording, middleware performance, or both, then define checks that demonstrate the chosen behavior and performance change.

Written by the indexing model from the issue text.