Add rate limiting for export

**Problem**
When working with middleware, 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 no file, test, or entry point, and its title does not match the body. First clarify whether the work is export rate limiting or middleware error messages, then locate the relevant entry point and add tests that define completion.

Written by the indexing model from the issue text.