Add configuration options for serialization

**Problem**
When working with routes, 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 tracing the route-handling and serialization entry points mentioned in the issue, then identify where configuration is currently defined and where errors are formatted. Clarify which serialization options and route failures are in scope before changing anything; done should mean the agreed options work and produce more detailed error messages.

Written by the indexing model from the issue text.